Unless something has changed, not many. When we went a few years ago I think they only gave the Ohio Boys and Mark a couple of hits on your typical junk trails surface.
Andrew (Ray's other crew guy) went out for the fall event to help a friend and thought I was kidding about their lack of prep and how quick the track went away. He texted me pictures of how the oustanding trails staff let all the rubber get ripped out of the groove....
I would not go if you are trying to get front half data, maybe some WOT data, but unless you put the gravel tune-up in it, the car won't go far