it also depends on your soil type around your holes. I have alot of sand and we havent had rain in a month. We got 4" in 2 days and a week later my holes were dry on the Moisture meter. The sand wicks the water from my holes. I can water a spot and watch the water go down and down and down. I have to use h20 crystals also. Ive been irrigating mine every other day. But its been 104 with a heat index of 110 and lo humidity with a hot south breeze. I know this really doesnt answer your question but it gives you an idea on some of the factors you need to take into consideration.