Im new to irrigation myself this yr. 16 zones with 9 on one controller and 7 on the other. Ive got my larger one going anywhere from 30 mins to 1 hr. Ive still only got 1/3 of an inch running it the longest. But the wife has no water pressure in the morning to shower being we're on a well. So I usually don't get to run them as long. Starting at 11 and ending around 430-5am I have mine running every night alternating controllers to try and achieve every bit i can. I know its not ideal and i hope im not setting myself up for shallow roots. But thats all I can do. From what I have read from others, im not alone. It's just part of having a large yard. Or atleast thats what im hoping.