Just looking for some insight here in my thinking:
I have 7 zones and about 1.5 acre lot. My thought with having two different flex schedules is two fold:
Lessen the load on my well.
Shorten the watering time if days can be alternating.
I don't know if the Iro is "smart enough" to either randomize or just run the second flex schedule on a different day? By shortening the time I mean that the last zones could be watering close to mid morning and in the summer it could be fairly hot by then evaporating the water before it soaks in.