I'm trying to set up my agenda within an event by adding sessions but I only have the option of adding a start time in 30 minute increments within these sessions. There will be a 15 minute break in my event which means the hour-long sessions coming after that break will be starting at 15 past (11:15, 12:15, etc.) It looks like the duration field cannot be changed. Is it possible to modify the start time and end time drop down lists to allow selections in 15 minute increments?