depends on your setup. motor , esc, lipo, headspeed, pinion , blade size, the list goes on and on. what are you running with? i have a trex450sa with the align 430xl and align 35x with the justGOFLy 450F with 11t pinion and the 325 blades, with the thunderpower 25c 2200mah I will get 3000 rpm with 5 full minutes in idle up. in normal i will get 8 minutes max.