It varies greatly. You have to figure 1-1/2-2-1/2 hrs setup and teardown time before you hit the key. Mr. P got a very good deal. Myself, I've only had my junk or friends motors on mine and I have yet to charge a dime. I just told them to supply the fuel and replace an egt probe if one failed. I've yet had to replace one. One of my friends motors was on for almost a week playing with the combo. Another was on about 3 days sorting it out.