I suspect that the worlds fastest crash by Arfons back in the day, which was caused by a burned bearing that siezed, might not have happened if he didn't have to worry about the one hour time constraint. I really don't know if it happened on the down run or the return run but if it was on the return run, shame on the rule! I cannot speak for the other cars but the rotation of the wheels at 800 MPH will be 12,500 on the nose wheel, 15,000 on the mid wheels and 8000 on the rear wheels. Inspection of the wheels and the bearings will be absolutley necessary after each run. Reloading the chutes and arming the charges, refilling the brake cooling system, refueling the car, repositioning the course marshalls, repositioning the fire and parametic folks, uploading the run data to the cloud and analyzing the results then changing my shorts just might take more than one hour. I vote for sunup to sundown for the two timed runs.