Not looking for super accuracy, just a range. I just think the number might be higher than most of us think. I get 1-1.5 hours out of a set of clutch bearings for instance, and about 8 minutes on 125cc of fuel, and a set of SS tires might last me 2 hours (with the last hour being used for practice). Factor in full size car fuel to/from the track (I know this varies but just average it), and your time driving/prepping the car, chemicals consumed (shock oil/diff oil)..I bet it's at least $50 an hour...