Honestly I use mine exclusively for racing, I got my LiPo's at the end of last year, raced 3 Sundays (4 runs per day) and I never pushed the limit of capacity so I can't really say how long you will get. In race conditions they were stellar start to finish for the 5 minute heavy throttle runs. This weekend is the first day of open practice so I plan to take them out for some more running and maybe with the temps outside so cool I'll run for more than 5 mins (I don't like to push the motor/speedo...thermal problems can result) Anyway I use the Competition Electronics 23 Amp Power Supply. The battery charge has been all over the map for me, 80% in 20 mins at 3C is not uncommon but I've started to lower the charge rate and still get to 80% in 30-35 mins. I've just made an adapter for checking voltage of the LiPo's while driving (using a Nomadio Sensor). Very slick.