I feel it is as simple as this: Would you rather spend all day at the drag strip for about 6-8 10-12 second runs, or spend all day at the autocross course for about 6 45-60 second runs, or spend all day at the road course driving the pi$$ out of your car for 4 30 minute lapping sessions, or more. 2 hrs of high speed seat time wins for me and results in a true permagrin.