No more than 15min ??

what if i gear it for like 35-40mph ?
and yes i'll be rung 2s 3s i series so 6s tot !
I'm not going to run the stock gearing !! I think i'll try a 16t pinion istead of the 20t stock one !
Could i get more runtime if i replace the stock 2200kv motor for like an 1500kv motor ? a neu or tekin