diff --git a/swh/web/misc/coverage.py b/swh/web/misc/coverage.py
--- a/swh/web/misc/coverage.py
+++ b/swh/web/misc/coverage.py
@@ -230,7 +230,7 @@
     ],
 }
 
-_cache_timeout = 5 * 60
+_cache_timeout = 60 * 60  # one hour
 
 
 def _get_listers_metrics(