diff --git a/.env.example b/.env.example
index a41fe9a..ea0a218 100644
--- a/.env.example
+++ b/.env.example
@@ -4,6 +4,8 @@ DATABASE_URL=sqlite:///./app.db
 SECRET_KEY=changeme-replace-in-production
 ADMIN_USERNAME=admin
 ADMIN_PASSWORD=change_me
+LDAP_SYNC_MIN_INTERVAL_HOURS=12
+LDAP_SYNC_LETTER_DELAY_SECONDS=5.0
 
 # Produktion (MariaDB + LDAP):
 # APP_ENV=production
diff --git a/app/core/config.py b/app/core/config.py
index bea7503..520d0a6 100644
--- a/app/core/config.py
+++ b/app/core/config.py
@@ -14,6 +14,8 @@ class Settings(BaseSettings):
     LDAP_SERVER: str = "gso1.ads1.fh-nuernberg.de"
     LDAP_DOMAIN: str = "ADS1"
     LDAP_SEARCH_BASE: str = "OU=users,OU=EFI,OU=Faculties,DC=ADS1,DC=fh-nuernberg,DC=de"
+    LDAP_SYNC_MIN_INTERVAL_HOURS: int = 12
+    LDAP_SYNC_LETTER_DELAY_SECONDS: float = 5.0
     ADMIN_USERNAME: str = "admin"
     ADMIN_PASSWORD: str = "change_me"
 
diff --git a/tests/test_config.py b/tests/test_config.py
index 7a588a0..0157ebf 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -9,3 +9,5 @@ def test_new_config_fields_have_defaults():
     assert s.LDAP_SERVER == "gso1.ads1.fh-nuernberg.de"
     assert s.LDAP_DOMAIN == "ADS1"
     assert "EFI" in s.LDAP_SEARCH_BASE
+    assert s.LDAP_SYNC_MIN_INTERVAL_HOURS == 12
+    assert s.LDAP_SYNC_LETTER_DELAY_SECONDS == 5.0