hey trogdor,(hehe, good name:-) I'm not sure how long... I've only flown it once, but I had only fillled the tank one time and I had been running the engine on and off for a good half hour getting it tuned right. when i took it up, i only flew for about 5 or 6 min. cause of the rain.
I would guess a good 12 to 15 min??