I have seen my Gleaner Dealer deliver a combine in 12 working hrs from the time it was unloaded from the semi to the field. And about 2 to 2 1_2hrs to switch from crop to crop once the combine has been delivered. All of which can be done on the same farm in the same field with about 5 wrenches, if you brought the other head behind_with you. I have worked with the neighbors on JD, CaseIH, TR,and Massey_White and the Gleaner is the fastest change from crop to crop, and the neighbors who have the Gleaners will really go over the machine before harvest, more so than the others, maybe more picky, only Massey has less moving parts to worry about. I have alot of respect for the TR's and Axials as well for their simplicity.