It depends.

I fly a 500 watt 3D Hobbyshop Extra SHP on 2100 3s lipos and get 7 minutes with no problem.

At WOT it draws 43 amps having a similar profile to his setup.

Power draw is not linear with throttle, so 1/2 throttle doesn't mean 21 amps.

WOT provides extreme vertical and is seldom used for more than 10 - 15 second bursts.