15 minutes is ridiculously fun, and about average. My "450" sized quadcopter (4x 10" rotors) gets about 13-15 minutes with about 150g payload on top of the 3.3

15 minutes is ridiculously fun, and about average. My "450" sized quadcopter (4x 10" rotors) gets about 13-15 minutes with about 150g payload on top of the 3.3Ah 3S battery. I carry a GoPro Hero HD camera sans waterproof case combined with a video transmitter and 15 minutes of first-person flying can be quite rewarding and almost tiring at times, especially in exciting environments (between trees, etc.). I'd strongly recommend picking up a MultiWii board and a cheap transmitter and parts from HobbyKing and trying it out - learning to fly isn't too difficult since they stabilize themselves, and starting out will cost less than $500. Watch out though - it's addictive!