Want to go faster?
The car that is the master of the ring's 24 hour enduro:
http://www.youtube.com/watch?v=kt-GMUUElVI
The Manthey Racing RSR's (they run more than 1) lap the old part of the ring, shown in that Vette video, in around 7 minutes flat. In traffic. For 24 hours. They also use, as in the video, the F1 part of the track, which is where the pits are located.