i run 6oz tanks on my proflies, they last quite a while (i can putt around and it will last more than 30 min) on a .40 os gpa and about 25 min on a ax55 flying just above idle
i have a 8oz tank with a gms.47, i add just under a half tank after about 8min of imac flying (most of the time above .5 throttle)


you should be fine