You can create 2 schedules one ending by 6am, and create another schedule to start at 7am or whatever time is best. You can put so many zones you wish to water by 6am and follow up the rest of the zones with the 2nd time watering schedule.
That's what I did, the wife needs to use the shower daily 6:30am to 7:30am. So I created 2 watering times to accomadate her wishes.
Hope that helps,