Go to districtgov.org and click on "water wise." It will give you the length of time for rotors and sprayer heads. When we moved in 8 years ago our timer was already set for day & time to start; it went by our address so everyone on the street was not watering at the same time. I also read that 4am is a good time to start. Never water during the daytime. Make sure you have the programmer plugged into a point-of-service surge protector;also your garage door opener. When you're back here, if you live in Sumter County, have them do an energy audit and they will give you a bunch of different surge protectors.