Time watering means nothing.
Every system is different. Every zone may have a different time.
GPM of each nozzle can vary greatly.
Place shallow cans around each zone, adjust the time to get 1/2"-3/4" per watering.
Corner rotors only travel 90 deg., so replace the nozzle with a lower GPM.
There are many YT vids on how to fine-tune your system.
A time that works for your system may not be the same as your neighbors.
Home page