It depends on the driver too though along with what kv the motor is.

A really good example is my VTA racing. When I started I was alot more aggressive with the throttle and would routinely pull 1200+ mah out in a 6 min race. After I got some more experience I now am pulling around 650-750 for the same period.

A similiar thing can be said for motor selection. A lower kv motor will generally be easier on mah over a race. I run a 2200kv and if I swapped to a 1700 or so I would get longer run times. I wouldn't have the same punch/speed combo but it would be able to run longer.

Another alternative is go to 5s 5000mah packs and dial back your end points. This should give you a little more run time.