FWIW, I have flown with 2 Canon S100s (no gimbal). I can usually get at least 10-11 minutes of flight time. Wind will also definitely be a factor.
The S100 weighs 7.0 ounces. The Mapir camera weighs 2.3 oz with battery. So, my two S100's equal 6 Mapir cameras in weight. Though, you...