diff --git a/nateman/blueprints/auth.py b/nateman/blueprints/auth.py
index dc87978..80409c2 100644
--- a/nateman/blueprints/auth.py
+++ b/nateman/blueprints/auth.py
@@ -179,7 +179,9 @@ def login():
 
     current_app.logger.info(f"{lehrer} hat sich angemeldet.")
 
-    session_expiry_delta = timedelta(days=12) if remember_me else timedelta(hours=1)
+    session_expiry_delta = timedelta(
+        minutes=(config["auth"]["session-remember-me-duration"] if remember_me else config["auth"]["session-duration"])
+    )
     session = Session.create(lehrer, session_expiry_delta)
 
     if not lehrer.pwd_changed:
diff --git a/nateman/resources/default-config.yml b/nateman/resources/default-config.yml
index 4a26ab5..a3cefbe 100644
--- a/nateman/resources/default-config.yml
+++ b/nateman/resources/default-config.yml
@@ -17,6 +17,14 @@ default-new-lehrer-password: ""
 #email-address-format: ""
 
 
+auth:
+  # Maximale Anmeldesitzungslänge in Minuten
+  session-duration: 60
+  # Maximale Anmeldesitzungslänge mit aktiviertem "Angemeldet bleiben" in Minuten
+  # Voreinstellung: (90 * 24 * 60) Minuten = 90 Tage
+  session-remember-me-duration: 129600
+
+
 schule:
   # Name der Schule
   name: "Max-Mustermann-Schule"