Fixed daily schedule between 10am and 4pm

Hello. I have a new lawn requiring daily watering for 20 minutes every two hours 10am, 12, 2pm and 4pm. From what I can see, I can start at 10am but I cannot set an end time?
Do I need to stop the schedule manually each and every day, otherwise it will water 12 times per day instead of 4 times per day?

I’ve just read another posters question which is similar. I think the only way to do this is to set up 4 different schedules. Is this the easiest way to do it?
Thanks. in advance.

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4 schedules is the easiest and best IMHO. That way, as the lawn starts to take hold, you can delete schedules to reduce watering. This is how I handle my winter rye overseed every year.