Changed update interval to 15 seconds.

src/assets/js/backend_calendar_table_view.js

@@ -804,7 +804,7 @@ window.BackendCalendarTableView = window.BackendCalendarTableView || {};
         // Auto-reload the results every one minute.
         var interval = setInterval(function() {
             $('#reload-appointments').trigger('click');
-        }, 60000); 
+        }, 15000); 
     };
 
 })(window.BackendCalendarTableView);