Sounds like they are building job security. 
What kind of grass, soil, sprinkler heads, …?
Lots to consider to determine water requirements for each zone.
Read this thread: Don’t understand zone run times for Rachio 3
Sounds like they are building job security.
What kind of grass, soil, sprinkler heads, …?
Lots to consider to determine water requirements for each zone.
Read this thread: Don’t understand zone run times for Rachio 3