I agree with Kirk. The 12 hour at Summit ran from 12 to 12, and 11 to 11. Workers asked for less night time and the BOD changed it to 9 to 9. Drivers balked and didn't enter since they wanted more night driving than a 9 PM in June. The BOD then decided that endurance racing was dying due to lack of entries and pulled the plug. The good folks in NJ picked up the event and the rest is good history. Perhaps a poll of workers and drivers can reach a consensus on the best start/stop time. But my vote is 10 to 10.
Chuck