There's been some conflicting information, but I believe registration opens at 8:00, drivers' meeting is at 9:30, and first car away at 10:00 am. For this event there's no lunch break, so it will keep on running until about 3:30 or so I expect.
I'll be happy to give you a ride on one of my runs if you want. It's always more fun from the inside.
Other folks will usually be glad loan you their passenger seat too, until maybe the last couple of runs in the day when they're trying to slice off the last couple of tenths.