The number of days changes with the season. It will depend on the water district you are in.
In general, in the summer, you probably want 2 days a week with about 3/4 of an inch to an inch of water each time for new lawns. You want the roots to grow down into the ground. In the rainy season (yes in the summer) I turn my system off unless the grass shows signs of stress. Saves a lot of water. I would not cut back on water on a new lawn.
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