I know I can hit the 6:30 min mark without going past 3.74V per cell and right at the 80% rule .I have my timer for 3:50 but always fly about a min past it.Just for the hell of it I flew for 5:45 min's and still had close to a min left in the pack's (put back 4297mAh between both and voltage was 3.79V per cell ) and still had a butt load of power.So I pretty much hit my goal with some 2 year old 200+ cycle pack's and a crappy/non efficient Align 700M motor that has a warn upper bearing lol ..Can't wait to see what it's like with some brand new pack's and better/more efficient motor,that's if I have enough $$ for a new/used motor.If not,i'll change the bearing in this one and see what happens.

Another thing im thinking about and could be wrong,but I noticed this with all my other electrics going from summer to winter.Once it get's cold out (20F to 30F),I loose about 45 secs of flight time.Once the warm weather get's here,I could get close to 7:30 min's of 3D flying all day with it.Im more than happy with the 6:30 min's but 7:30 min's will be awesome .
Running it at 2120RPM now with a 18T pinion,it's perfect now.O-yeah,i'll for sure be FBL in the next few week's so that will open the door a little also .

BTW,
If anyone is looking for new lipo's to start the year off,check out the Gravity lipo's ..The guy I bought mine from had them for 2 year's and over 200 cycle's in a 500 size heli.So far I have over 50 cycle's on them.Im not close a hard core/hot pilot but I beat on them pretty good everyday.Ran them at 2000RPM,2350RPM and now 2120RPM with 13 degrees of pitch useing it all most of the flight..