Well, that one may be a hard one to answer. Most guys are using Lipo in 1/8 electric conversions. I havent heard of anyone using a NIHM pack in an 1/8 yet. I get about 17-18 minutes in a
1/10 2WD Buggy with a 10.5 brushless and a Slingshot 4500. Your truggy is twice the weight with about twice the motor. Does that mean you get half the runtime

Not sure...