There were 3 groups. Advanced, Intermediate, and Super Street. I was in Super Street. Each group had 20 minutes then the next group and so on. 30 minute break for lunch and at it again. It went on all day. Last run was at 4:30 or so.
As far as speeds I would be guessing around 100-120. Only in one part of the track. It was very technical. Second gear for the whole thing other than the main staight.
Marc "Howlin Mad"