I have the Hunter MP rotator heads on my irrigation system and it takes 50 minutes per zone to get a 1/2 inch of water. Your results may vary but I used the tuna can system to measure and that's how long it takes for mine.
I did try shortening the cycles and water 3 times a week but my St. Augustine didn't like it. I was starting to get some fungus from that method and was told that it is better to let the grass dry out a little so the roots grow deeper.
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