Scheduling Help - Have a set start time and end time

I’m seeking assistance setting up a watering schedule for my yard. I have a mandated watering time on Monday mornings from 12:01 to 6:00 a.m., so I must use a fixed schedule. When I created an automated schedule starting at 12:00, it was set to run for nearly 6 hours without Smart Cycle turned on. Since I can only have a set start time OR a set end time, how do I best leverage those 6 hours to get the best results?

I would create a schedule that runs @ 12am, and see what the schedule looks like with smart cycle on. Sometimes the soaking times will be absorbed into the schedule, especially if it is running for that long.