I don't have a sprinkler system. I have been putting a sprinkler out for about 3 hours in one spot, and I only have to water it once every 7-10 days. The short, frequent waterings promote shallow roots. The long soaking waterings promote deeper roots, that deep water evaporates slower than the surface moisture.
Same here. I water about twice a week. I keep the sprinkler in the same spot for 45 - 60 minutes. I have it in 3 to 4 places to cover the yard. This is the front only.
My back has more shade, so it doesn't dry as badly, and I don't care what it looks like as much. I am reseeding it this fall anyway.