diff --git a/common.nix b/common.nix
index e51ce81..6e40609 100644
--- a/common.nix
+++ b/common.nix
@@ -113,7 +113,7 @@ in
         btrfs subvolume delete "$1"
     }
 
-    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +7); do
         delete_subvolume_recursively "$i"
     done