[MetalMan]

The amp rating on a motor is just its nominal amperage. You can figure out how many amps are pulled average by the motor. Divide 60mins. by your run time, and then multiply that number by the capacity of your battery. So, let's say you got 15mins on 4000mah. That means that the average amp draw would be 16,000ma, or 16amps. Basically, continuous amps drawn in a monster truck might be 15-25amps depending upon the motor. But high amp bursts are the reason why batteries will heat up.

Do you mean to say "whatI was really asking as for advice as to what motor I can use that won't overheat or worse fry my controller and Lipos."?
If it is, you could go with a 8XL on 5s Lipo. You would get very good runtime with this setup, and it wouldn't be too hard on the motor, controller, or batteries (not much heat). If you want to spend as little on batteries as possible, you could probably use batteries that are rated at 40amps continuous in this setup.