RE: Flight time?
it depends on the plane, engine, prop, nitro content, and how heavy you are on the throttle.
he longest ive flown on 8oz is 47min and 15 sec with a gp rapture (average sports plane, not a glider) that was w/ a gms .47, wildcat 10% nitro and 11x5 apc prop
for the most part if your are flying in circles, 20+ min. aeorbatics 15 min, wide open throttle 10 min.