Adjust default MFA rate-limit

service/src/main/java/org/whispersystems/textsecuregcm/limits/RateLimiters.java

@@ -65,7 +65,7 @@ public class RateLimiters extends BaseRateLimiters<RateLimiters.For> {
     CREATE_DONATION_PERMIT("createDonationCredential", new RateLimiterConfig(30, Duration.ofHours(4), true)),
     ONE_TIME_DONATION("oneTimeDonation", new RateLimiterConfig(5, Duration.ofMinutes(1), true)),
     ADD_SUBSCRIPTION_PAYMENT_METHOD("addSubscriptionPaymentMethod", new RateLimiterConfig(10, Duration.ofMinutes(1), true)),
-    CHECK_MFA("checkMfa", new RateLimiterConfig(5, Duration.ofSeconds(6), false))
+    CHECK_MFA("checkMfa", new RateLimiterConfig(50, Duration.ofHours(12), false))
     ;
 
     private final String id;