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Easiest way I know is with 2 Omron Timers. Most Electrical wholesalers/commercial contractors will have Omron Timers. H3CR is the model code I use. With the 2 timers, you wire them up so the one sets on time, then the other sets the off time. You will probibally not find a ready made timer setup for purchase for your unique application. If you need help, I can draw you out a wiring schematic for wiring. They should also be able to help you at the Elec supply store