diff --git a/bundles/icinga2/items.py b/bundles/icinga2/items.py
index fd51b34..607d098 100644
--- a/bundles/icinga2/items.py
+++ b/bundles/icinga2/items.py
@@ -385,7 +385,7 @@ for rnode in sorted(repo.nodes):
             'host': rnode.name,
             'comment': f'Downtime for upgrade-and-reboot of node {rnode.name}',
             'times': {
-                DAYS_TO_STRING[day%7]: f'{hour}:{minute}-{hour}:{minute+30}',
+                DAYS_TO_STRING[day%7]: f'{hour}:{minute}-{hour}:{minute+15}',
             },
         })
     elif (
@@ -401,7 +401,7 @@ for rnode in sorted(repo.nodes):
             'host': rnode.name,
             'comment': f'Downtime for upgrade-and-reboot of node {rnode.name}',
             'times': {
-                DAYS_TO_STRING[day%7]: f'{hour}:{minute}-{hour}:{minute+30}',
+                DAYS_TO_STRING[day%7]: f'{hour}:{minute}-{hour}:{minute+15}',
             },
         })