diff --git a/lib/calcms/events.pm b/lib/calcms/events.pm
index 3d83c61..952939b 100644
--- a/lib/calcms/events.pm
+++ b/lib/calcms/events.pm
@@ -1096,6 +1096,7 @@ sub get_query($$$) {
             ,e.id                 event_id
             ,e.start
             ,e.end
+            ,TIMEDIFF(e.end,e.start)      duration
             ,e.time_of_day
             ,e.program
             ,e.series_name