It is difficult to give an answer in terms of time since there is considerable variability due to soil type, temperatures and thus demand for water, etc. Basically when you water apply enough to give the root ball a good soaking. If you make a raised soil berm around the tree extending about 18" out from the trunk in a circle, then fill it with water, that will provide a good soaking. For a new tree two or three waterings a week should be sufficient. As it becomes better established it should be reduced to one every week and eventually it may need only occasional watering.
For now try using a hose to water the area of the root ball and a few feet beyond it. That way the entire area is not being kept too wet. In a couple of months you can transition over to the sprinkler system. Place a rain gauge or straight-sided container in the area and run the sprinklers until you have caught an inch or more of water. Then you will know how long to run the cycles when you water.
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