New Event - changing default end time

I’ve set time increments so that events can be made at 5 minute intervals…

I’d like to have in the end time, that it would default instead of going to 5 mins ahead of the the start time, could I set it to go at 30 mins ahead of the start time and then if the event needs to be adjusted up or down 5 mins, it can be adjusted?

you can do it via client-side API.
Usually default values can be set using DHXScheduler.InitialValues collection, however in this case the end date should be calculated dynamically so you can trace onEventCreated event, and assign value from there:

scheduler.attachEvent("onEventCreated", function(id){ var event = scheduler.getEvent(id); event.end_date =, 30, "minute"); });