Like Twowaxhack says. Pumps are made to run 24/7/365. I have one pumping stock water that hasn't shut off in over 19 years so far. Cycling on and off is what kills pumps, and running sprinklers makes pumps cycle on and off a lot. Adding a Cycle Stop Valve is an easy fix. You don't want the trouble and expense of double pumping unless you have to. Even then you still need a way to keep the sprinkler pump from cycling. You can use a Cycle Stop Valve on a booster pump as well if you like, but one on the well pump is all you need.