diff --git a/guix-data-service/substitutes.scm b/guix-data-service/substitutes.scm
index 2a6df3c..a12d615 100644
--- a/guix-data-service/substitutes.scm
+++ b/guix-data-service/substitutes.scm
@@ -258,5 +258,5 @@
                    (all-git-repositories conn))))
 
                (simple-format #t "finished checking substitutes, now sleeping\n")
-               (sleep (* 60 30)))))
+               (sleep (* 60 60 6)))))
          #:unwind? #t)))))