Depending on what Novak motor you go with will determine runtime. I have seen 10.5 motors go for over 20 minutes on a 4800 Orion Li-po and 5.5 motors will be real close to making 30 minutes with an 8000 MaxAmps li-po both on an 1/8th scale size big track with big jumps. I prefer the MaxAmps 8000 with a Novak 7.5 that is a real good all around motor that is not too much power for a 2wd truck.
Thunder Power also makes an 8000 mah battery that fits in the truck. TP8000-2S4P id the number.
Good luck!
Note: I get a little over 40 minutes of run time with the 7.5 Novak motor and 8000 mah MaxAmp battery in my T-4.