Run time all depends on the quality/capacity of your batteries, and how trigger-happy you are. With 1500 packs I would expect to get anywhere from 5-8 minutes of run time. With 3000 packs it would probably be around 15 minutes, and with 3700s it would probably be around 20 minutes. This is just estimating though... If you're light on the throttle you could make 1500s last for 9-11 minutes.