[RC-Monster Mike]

Loaded question, Mike! There are quite a few answers to this question. Ideally, i would recommend a slow motor with high voltage. For a 20 minute run, coling measures must be taken into consideration as well(for the motor). 6s Lipo (5000mah or so) and a1600Kv motor(or similar rpm motor) should get you to the 20 minute mark, as long as you don't gear to the moon and run big, heavy tires. For long runtime, get some decent lipos(don't need to handle terribly high amps, but lots of mah would be ideal). I think I could get close to 20 minutes with my dual PQ 4s 3100s in parallel with the xl2400 motor(it wouldn't be terribly fast, but could easily beat the brushed motors and hang with the Novaks). Maybe even witn the 2800xl.