Auto-book align with logical time slots

The Auto-book feature is working really well for us, but I'm getting comments that users don't like how it books unnatural time slots. Like it will book a timeslot of 10:12am - 10:42am. I'd like the option for it to just book the room up to the next logical :00 or :30 increment.

So with the example of auto-booking at 10:12am, it would book 10:12am-10:30am, and then if the users were still in there at 10:30am, it would book again until 11:00am.