If you want to maintain a healthy lawn, we recommend that you get 1 inch of moisture on your lawn every week.  Pro tip: run your sprinkler and see how long it takes to fill a measuring just with an inch of water. You’ll find that most decent sprinklers will produce an inch of water in an hour. Therefore, we recommend watering your garden for half an hour twice a week. However, if the weather is particularly hot and dry, run the sprinklers for double the suggested amount of time.