7 guys, 50 or so hours, 3 single stage small snow blowers. Roof is approximately 35' by 120' with 3' sides around it. Do you keep the same 70 or so an hour, cut it to 50 or ... Also have seen some larger roofs getting done. One guy spent over 12 hours with 20 guys doing a roof and did not finish. I'd hate to see that bill.