This information is incredibly hard to get from most multirotor makers, because it's always really bad and they don't like to be compared to each other.

From the battery size & numbers for this general class of quad I'd guess 15-20 minutes (confidence +/- 5 minutes), although that depends whether you put a camera on or not, and if so what.

Our DJI S800 airframes will go to 30 minutes with a full load of batteries, but they are much larger and more efficient.

It says at the bottom of the "Features" (http://www.dji-innovations.com/feature/phantom-features/) page 10-15 minutes of flight time.