Watering Lawn Times?

typically you should only water early in the AM, but the only way to know timing for your sprinkler would be to put a couple of cups in your yard and measure the water depth after a certain amount of time. so after 30 minutes, if you have 1/4 inch then you know how long you need to water for a desired amount.

and more, less often is generally what you want. so instead of 1/4 inch 4 days in a row, you could shoot for 1 inch every 4 days (TWSS)

Early morning before sunrise to break the up the dew/fungus cycle and have some time to soak in before full sun/heat.