I use two 2s1p TrakPower Lipo pack wierd in series for 4s. I was going to try and get run times today but ran out of time.
Seriously I think it is around 20 minutes. Next time I get a chance I'll measure for you. There is a thread here that is stickied for run times. Maybe check it for info.
Check out the flight power or neu energy I might go with them next.
Mark