I use 16/46, and get about 15-20 mins with my lvc set at 3.5v usieng my smc 2s 5200 40c packs. Thats just ripping around on the front street. With my baby smc 3s 3400 18c I get about 10 mins heheh. Ive never been to a track tho, so I cant say how long they would last on one..