diff --git a/homeassistant/components/saunum/__init__.py b/homeassistant/components/saunum/__init__.py
index db783e0e5d3..e9bea5f7c06 100644
--- a/homeassistant/components/saunum/__init__.py
+++ b/homeassistant/components/saunum/__init__.py
@@ -15,6 +15,7 @@ PLATFORMS: list[Platform] = [
     Platform.BINARY_SENSOR,
     Platform.CLIMATE,
     Platform.LIGHT,
+    Platform.NUMBER,
     Platform.SENSOR,
 ]
 
diff --git a/homeassistant/components/saunum/icons.json b/homeassistant/components/saunum/icons.json
index 854fcee7ff5..186f86a6d86 100644
--- a/homeassistant/components/saunum/icons.json
+++ b/homeassistant/components/saunum/icons.json
@@ -1,5 +1,13 @@
 {
   "entity": {
+    "number": {
+      "fan_duration": {
+        "default": "mdi:fan-clock"
+      },
+      "sauna_duration": {
+        "default": "mdi:clock-edit-outline"
+      }
+    },
     "sensor": {
       "heater_elements_active": {
         "default": "mdi:radiator"
diff --git a/homeassistant/components/saunum/number.py b/homeassistant/components/saunum/number.py
new file mode 100644
index 00000000000..cd12df201cc
--- /dev/null
+++ b/homeassistant/components/saunum/number.py
@@ -0,0 +1,143 @@
+"""Number platform for Saunum Leil Sauna Control Unit."""
+
+from __future__ import annotations
+
+from collections.abc import Awaitable, Callable
+from dataclasses import dataclass
+from typing import TYPE_CHECKING
+
+from pysaunum import (
+    MAX_DURATION,
+    MAX_FAN_DURATION,
+    MIN_DURATION,
+    MIN_FAN_DURATION,
+    SaunumClient,
+    SaunumData,
+    SaunumException,
+)
+
+from homeassistant.components.number import (
+    NumberDeviceClass,
+    NumberEntity,
+    NumberEntityDescription,
+)
+from homeassistant.const import UnitOfTime
+from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import HomeAssistantError, ServiceValidationError
+from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
+
+from . import LeilSaunaConfigEntry
+from .const import DOMAIN
+from .entity import LeilSaunaEntity
+
+if TYPE_CHECKING:
+    from .coordinator import LeilSaunaCoordinator
+
+PARALLEL_UPDATES = 0
+
+# Default values when device returns None or invalid data
+DEFAULT_DURATION_MIN = 120
+DEFAULT_FAN_DURATION_MIN = 15
+
+
+@dataclass(frozen=True, kw_only=True)
+class LeilSaunaNumberEntityDescription(NumberEntityDescription):
+    """Describes Saunum Leil Sauna number entity."""
+
+    value_fn: Callable[[SaunumData], int | float | None]
+    set_value_fn: Callable[[SaunumClient, float], Awaitable[None]]
+
+
+NUMBERS: tuple[LeilSaunaNumberEntityDescription, ...] = (
+    LeilSaunaNumberEntityDescription(
+        key="sauna_duration",
+        translation_key="sauna_duration",
+        device_class=NumberDeviceClass.DURATION,
+        native_unit_of_measurement=UnitOfTime.MINUTES,
+        native_min_value=1,
+        native_max_value=MAX_DURATION,
+        native_step=1,
+        value_fn=lambda data: (
+            duration
+            if (duration := data.sauna_duration) is not None and duration > MIN_DURATION
+            else DEFAULT_DURATION_MIN
+        ),
+        set_value_fn=lambda client, value: client.async_set_sauna_duration(int(value)),
+    ),
+    LeilSaunaNumberEntityDescription(
+        key="fan_duration",
+        translation_key="fan_duration",
+        device_class=NumberDeviceClass.DURATION,
+        native_unit_of_measurement=UnitOfTime.MINUTES,
+        native_min_value=1,
+        native_max_value=MAX_FAN_DURATION,
+        native_step=1,
+        value_fn=lambda data: (
+            fan_dur
+            if (fan_dur := data.fan_duration) is not None and fan_dur > MIN_FAN_DURATION
+            else DEFAULT_FAN_DURATION_MIN
+        ),
+        set_value_fn=lambda client, value: client.async_set_fan_duration(int(value)),
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: LeilSaunaConfigEntry,
+    async_add_entities: AddConfigEntryEntitiesCallback,
+) -> None:
+    """Set up Saunum Leil Sauna number entities."""
+    coordinator = entry.runtime_data
+
+    async_add_entities(
+        LeilSaunaNumber(coordinator, description) for description in NUMBERS
+    )
+
+
+class LeilSaunaNumber(LeilSaunaEntity, NumberEntity):
+    """Representation of a Saunum Leil Sauna number entity."""
+
+    entity_description: LeilSaunaNumberEntityDescription
+
+    def __init__(
+        self,
+        coordinator: LeilSaunaCoordinator,
+        description: LeilSaunaNumberEntityDescription,
+    ) -> None:
+        """Initialize the number entity."""
+        super().__init__(coordinator)
+        self._attr_unique_id = f"{coordinator.config_entry.entry_id}-{description.key}"
+        self.entity_description = description
+
+    @property
+    def native_value(self) -> float | None:
+        """Return the current value."""
+        return self.entity_description.value_fn(self.coordinator.data)
+
+    async def async_set_native_value(self, value: float) -> None:
+        """Set new value."""
+        # Prevent changing certain settings when session is active
+        session_active = self.coordinator.data.session_active
+        if session_active and self.entity_description.key in (
+            "sauna_duration",
+            "fan_duration",
+        ):
+            raise ServiceValidationError(
+                translation_domain=DOMAIN,
+                translation_key=f"session_active_cannot_change_{self.entity_description.key}",
+            )
+
+        try:
+            await self.entity_description.set_value_fn(self.coordinator.client, value)
+        except SaunumException as err:
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="set_value_failed",
+                translation_placeholders={
+                    "entity": self.entity_description.key,
+                    "value": str(value),
+                },
+            ) from err
+
+        await self.coordinator.async_request_refresh()
diff --git a/homeassistant/components/saunum/strings.json b/homeassistant/components/saunum/strings.json
index bc7bf3803ed..e72fad37fa6 100644
--- a/homeassistant/components/saunum/strings.json
+++ b/homeassistant/components/saunum/strings.json
@@ -55,6 +55,14 @@
         "name": "[%key:component::light::title%]"
       }
     },
+    "number": {
+      "fan_duration": {
+        "name": "Fan duration"
+      },
+      "sauna_duration": {
+        "name": "Sauna duration"
+      }
+    },
     "sensor": {
       "heater_elements_active": {
         "name": "Heater elements active",
@@ -72,6 +80,12 @@
     "door_open": {
       "message": "Cannot start sauna session when sauna door is open"
     },
+    "session_active_cannot_change_fan_duration": {
+      "message": "Cannot change fan duration while session is active"
+    },
+    "session_active_cannot_change_sauna_duration": {
+      "message": "Cannot change sauna duration while session is active"
+    },
     "session_not_active": {
       "message": "Cannot change fan mode when sauna session is not active"
     },
@@ -86,6 +100,9 @@
     },
     "set_temperature_failed": {
       "message": "Failed to set temperature to {temperature}"
+    },
+    "set_value_failed": {
+      "message": "Failed to set {entity} to {value}"
     }
   }
 }
diff --git a/tests/components/saunum/snapshots/test_number.ambr b/tests/components/saunum/snapshots/test_number.ambr
new file mode 100644
index 00000000000..80f63e8443d
--- /dev/null
+++ b/tests/components/saunum/snapshots/test_number.ambr
@@ -0,0 +1,119 @@
+# serializer version: 1
+# name: test_entities[number.saunum_leil_fan_duration-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+      'max': 30,
+      'min': 1,
+      'mode': <NumberMode.AUTO: 'auto'>,
+      'step': 1,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'number',
+    'entity_category': None,
+    'entity_id': 'number.saunum_leil_fan_duration',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'options': dict({
+    }),
+    'original_device_class': <NumberDeviceClass.DURATION: 'duration'>,
+    'original_icon': None,
+    'original_name': 'Fan duration',
+    'platform': 'saunum',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'fan_duration',
+    'unique_id': '01K98T2T85R5GN0ZHYV25VFMMA-fan_duration',
+    'unit_of_measurement': <UnitOfTime.MINUTES: 'min'>,
+  })
+# ---
+# name: test_entities[number.saunum_leil_fan_duration-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'duration',
+      'friendly_name': 'Saunum Leil Fan duration',
+      'max': 30,
+      'min': 1,
+      'mode': <NumberMode.AUTO: 'auto'>,
+      'step': 1,
+      'unit_of_measurement': <UnitOfTime.MINUTES: 'min'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'number.saunum_leil_fan_duration',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '10',
+  })
+# ---
+# name: test_entities[number.saunum_leil_sauna_duration-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+      'max': 720,
+      'min': 1,
+      'mode': <NumberMode.AUTO: 'auto'>,
+      'step': 1,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'number',
+    'entity_category': None,
+    'entity_id': 'number.saunum_leil_sauna_duration',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'options': dict({
+    }),
+    'original_device_class': <NumberDeviceClass.DURATION: 'duration'>,
+    'original_icon': None,
+    'original_name': 'Sauna duration',
+    'platform': 'saunum',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'sauna_duration',
+    'unique_id': '01K98T2T85R5GN0ZHYV25VFMMA-sauna_duration',
+    'unit_of_measurement': <UnitOfTime.MINUTES: 'min'>,
+  })
+# ---
+# name: test_entities[number.saunum_leil_sauna_duration-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'duration',
+      'friendly_name': 'Saunum Leil Sauna duration',
+      'max': 720,
+      'min': 1,
+      'mode': <NumberMode.AUTO: 'auto'>,
+      'step': 1,
+      'unit_of_measurement': <UnitOfTime.MINUTES: 'min'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'number.saunum_leil_sauna_duration',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '120',
+  })
+# ---
diff --git a/tests/components/saunum/test_number.py b/tests/components/saunum/test_number.py
new file mode 100644
index 00000000000..dea753e0f40
--- /dev/null
+++ b/tests/components/saunum/test_number.py
@@ -0,0 +1,201 @@
+"""Test the Saunum number platform."""
+
+from __future__ import annotations
+
+from dataclasses import replace
+from unittest.mock import MagicMock
+
+from pysaunum import SaunumException
+import pytest
+from syrupy.assertion import SnapshotAssertion
+
+from homeassistant.components.number import (
+    ATTR_VALUE,
+    DOMAIN as NUMBER_DOMAIN,
+    SERVICE_SET_VALUE,
+)
+from homeassistant.const import ATTR_ENTITY_ID, Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import HomeAssistantError, ServiceValidationError
+from homeassistant.helpers import entity_registry as er
+
+from tests.common import MockConfigEntry, snapshot_platform
+
+
+@pytest.fixture
+def platforms() -> list[Platform]:
+    """Fixture to specify platforms to test."""
+    return [Platform.NUMBER]
+
+
+@pytest.mark.usefixtures("entity_registry_enabled_by_default", "init_integration")
+async def test_entities(
+    hass: HomeAssistant,
+    snapshot: SnapshotAssertion,
+    mock_config_entry: MockConfigEntry,
+    entity_registry: er.EntityRegistry,
+) -> None:
+    """Test all entities."""
+    await snapshot_platform(hass, entity_registry, snapshot, mock_config_entry.entry_id)
+
+
+@pytest.mark.usefixtures("init_integration")
+async def test_set_sauna_duration(
+    hass: HomeAssistant,
+    mock_saunum_client: MagicMock,
+) -> None:
+    """Test setting sauna duration."""
+    entity_id = "number.saunum_leil_sauna_duration"
+
+    # Verify initial state
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == "120"
+
+    # Set new duration
+    await hass.services.async_call(
+        NUMBER_DOMAIN,
+        SERVICE_SET_VALUE,
+        {ATTR_ENTITY_ID: entity_id, ATTR_VALUE: 180},
+        blocking=True,
+    )
+
+    # Verify the client method was called
+    mock_saunum_client.async_set_sauna_duration.assert_called_once_with(180)
+
+
+@pytest.mark.usefixtures("init_integration")
+async def test_set_fan_duration(
+    hass: HomeAssistant,
+    mock_saunum_client: MagicMock,
+) -> None:
+    """Test setting fan duration."""
+    entity_id = "number.saunum_leil_fan_duration"
+
+    # Verify initial state
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == "10"
+
+    # Set new duration
+    await hass.services.async_call(
+        NUMBER_DOMAIN,
+        SERVICE_SET_VALUE,
+        {ATTR_ENTITY_ID: entity_id, ATTR_VALUE: 15},
+        blocking=True,
+    )
+
+    # Verify the client method was called
+    mock_saunum_client.async_set_fan_duration.assert_called_once_with(15)
+
+
+@pytest.mark.usefixtures("init_integration")
+async def test_set_value_failure(
+    hass: HomeAssistant,
+    mock_saunum_client: MagicMock,
+) -> None:
+    """Test error handling when setting value fails."""
+    entity_id = "number.saunum_leil_sauna_duration"
+
+    # Make the set operation fail
+    mock_saunum_client.async_set_sauna_duration.side_effect = SaunumException(
+        "Write error"
+    )
+
+    # Attempt to set value should raise HomeAssistantError
+    with pytest.raises(HomeAssistantError):
+        await hass.services.async_call(
+            NUMBER_DOMAIN,
+            SERVICE_SET_VALUE,
+            {ATTR_ENTITY_ID: entity_id, ATTR_VALUE: 180},
+            blocking=True,
+        )
+
+
+@pytest.mark.usefixtures("init_integration")
+async def test_set_value_while_session_active(
+    hass: HomeAssistant,
+    mock_saunum_client: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test error when trying to change duration while session is active."""
+    entity_id = "number.saunum_leil_sauna_duration"
+
+    # Update mock data to have session active
+    base_data = mock_saunum_client.async_get_data.return_value
+    mock_saunum_client.async_get_data.return_value = replace(
+        base_data,
+        session_active=True,
+    )
+
+    # Trigger coordinator update
+    coordinator = mock_config_entry.runtime_data
+    await coordinator.async_refresh()
+    await hass.async_block_till_done()
+
+    # Attempt to set value should raise ServiceValidationError
+    with pytest.raises(
+        ServiceValidationError,
+        match="Cannot change sauna duration while session is active",
+    ):
+        await hass.services.async_call(
+            NUMBER_DOMAIN,
+            SERVICE_SET_VALUE,
+            {ATTR_ENTITY_ID: entity_id, ATTR_VALUE: 180},
+            blocking=True,
+        )
+
+
+async def test_number_with_default_duration(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_saunum_client: MagicMock,
+) -> None:
+    """Test number entities use default when device returns None."""
+    # Set duration to None (device hasn't set it yet)
+    base_data = mock_saunum_client.async_get_data.return_value
+    mock_saunum_client.async_get_data.return_value = replace(
+        base_data,
+        sauna_duration=None,
+        fan_duration=None,
+    )
+
+    mock_config_entry.add_to_hass(hass)
+    assert await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    # Should show default values
+    sauna_duration_state = hass.states.get("number.saunum_leil_sauna_duration")
+    assert sauna_duration_state is not None
+    assert sauna_duration_state.state == "120"  # DEFAULT_DURATION_MIN
+
+    fan_duration_state = hass.states.get("number.saunum_leil_fan_duration")
+    assert fan_duration_state is not None
+    assert fan_duration_state.state == "15"  # DEFAULT_FAN_DURATION_MIN
+
+
+async def test_number_with_valid_duration_from_device(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_saunum_client: MagicMock,
+) -> None:
+    """Test number entities use actual values from device when valid."""
+    base_data = mock_saunum_client.async_get_data.return_value
+    mock_saunum_client.async_get_data.return_value = replace(
+        base_data,
+        sauna_duration=90,
+        fan_duration=20,
+    )
+
+    mock_config_entry.add_to_hass(hass)
+    assert await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    # Should show actual device values
+    sauna_duration_state = hass.states.get("number.saunum_leil_sauna_duration")
+    assert sauna_duration_state is not None
+    assert sauna_duration_state.state == "90"
+
+    fan_duration_state = hass.states.get("number.saunum_leil_fan_duration")
+    assert fan_duration_state is not None
+    assert fan_duration_state.state == "20"