One thing I would like to mention to everyone; Do not ever read a manufacturer's advertised flight time and think you'll ever achieve it. Look at advertised flight times and subtract 15% to 20% from that value for a reasonable starting point. Everything done with the aircraft impacts flight time, speed it's flown at, how aggressive it's maneuvered, wind, lights on or off, using or not using the camera, raising and lowering the gear, even carrying the camera, impacts battery life and flight time.
When it comes to "flight time" every manufacturer uses the absolute best time they ever obtained, if they obtained them at all, flown with the lightest possible aircraft, in absolutely perfect conditions. Likely the aircraft was hovered in ground effect for all the flight time test flights. Those are things you will never, ever do.
Flight time is whatever you happen to get out of them, period.