Adjust default event duration to be 30 minutes

agenda/calendar.py

@@ -61,7 +61,7 @@ def build_events(events: list[Event]) -> list[dict[str, typing.Any]]:
             continue
 
         if e.has_time:
-            end = e.end_date or e.date + timedelta(hours=1)
+            end = e.end_date or e.date + timedelta(minutes=30)
         else:
             end = (e.end_as_date if e.end_date else e.as_date) + one_day
         item = {