Sounds like something is wrong with your system.
How many zones?
How long does each zone run? The time does depend on the type of spray heads so if you know what type.
My guess is there is a leak in one of your zones. Can you run each zone for say 10 minutes and read your water meter each time to see gallons used. If one zone uses a lot more water this might indicate a problem. I am assuming each zone is about the same size.
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