Using a pneumatic razor bar roof remover,time requiered to remove 1150 square feet of roof shingles? fjw75?

The Razor bar is not pneumatic, it's a hand tool. It looks like it goes faster then a roofing spade, but the time required depends on how fast you work. How steep is the roof? There are a lot of factors in play here. Figure on at least a day fro tearoff and cleanup, maybe 2. Hope this helps.