Depending on the size of the tree/shrub, each will have 1-6 2gph emitters. The run times are based off the calculations from the local “Water use it Wisely” document for us desert dwellers. They actually have a really good website that walks you thru recommended watering here in the desert. Also @azdavidr created an awesome spreadsheet that uses the “Water Use it Wisely” as its basis. azdavidr Excel Sheet Here!
The next screens on this interactive watering guide give you recommended intervals, and it almost matches Rachio to a T all year round.