I live in North Phoenix
It depends whether you use HE-VAN, VAN, U Series or Traditional MPR spray nozzles and the distance.
I use the HE-VANs that I installed last September.
I’ve noticed a large decrease in my water bill from switching to HE-VAN nozzles from the VAN nozzles and my October and November water bills were the lowest ever. I didn’t even get Rachio until early December 2020.
My nozzles are the HE-VAN 10, 12, and 15. The Precipitation rate is in 1.58"-2.24" on the extreme ends for my set up, with the vast majority within 1.72-1.99" per hour.
I have a turf-type tall fescue and hybrid bluegrass lawn.
I use Fixed Schedule for the lawn, as I change it a lot and know what it needs from previous years before Rachio. I need to dial in the Flex daily settings to match what I know my lawn wants.
My current schedule for June is 3-4 days a week 20-24 minutes per zone. I split it up into 8 minute cycle and soak for 52 minutes. You should be using less minutes per week than me with Bermuda than my cool season lawn.
I use Flex Daily for the my trees, shrubs and large flower pot zones. Flex Daily has saved so much water for the plants on drip.
I recommend the HE-VAN, U Series, R-VAN and MP rotators for pop up heads. I like the relatively high flow rates of the HE-VAN, U Series, and MP800s so all lawn and drip zones can complete within a 12 hour period