RE: Zenoah G-62 Run ?
At part throttle, doing mild airbatics & such, I've run over 20 minutes, and that's a little longer than I like to fly. Ten or fifteen minutes is about it, time for me to sit down.
A friend had an Extra with a G23, 10 0z tank, ran about 28 minutes with the throttle unhooked and no kill switch. He handed me the transmitter at 18 minutes, I flew another 10 before the tank ran dry, and handed the transmitter back.
The racing guys can probably tell you about full throttle consumption, and quote consumption in oz/minute and such.