Twice a week ,1/2 to 3/4 inch per watering, in the summer. Cut back to once per week in the winter and when cold you can cut back to less than that. I am watering once a week now and if it rains I skip a week. When it gets colder I water less than that. My sprinkler system is off at this time. I only turn it on if I think the lawn needs it. You need to water dormant grasses in the winter, at least twice a month, as the roots are still alive and need water even if the grass blades have turned all brown.
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