I attended a n irrigation seminar a few years back. I was told that when the ambient temperature gets above 75 degrees F, rotors should be set to water 40 minutes twice a week, and pop-ups 25 minutes twice a week. As others have commented, you should start your irrigation cycle between 3 AM and 4 AM depending on how many zones you have. Starting your irrigation cycle outside that window promotes either excessive evaporation or unwanted fungal growth.
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