Mine, on a beefy 1700 mAh battery, gets about 15 minutes of throttle on time, longer if you let it glide a lot.
My buddy's, with a 500mAh battery, get about 12-14 minutes but also has a smaller motor and glides much better so it can be stretched a lot longer than mine.
Of course, you can always buy more batteries or take your charger out to the field. I only have one battery, but my friend would have one running, one cooling, and one charging so he could always be flying.