Here is some FAQ's from Track Masters
Run Groups
Track Day info

The Saturday event is from 9am-5pm with a one hour lunch. 20-25 minute sessions divided among 4 run groups is about 4-5 runs in a day.

Newbies to Sonoma should really take the time to learn the lines as the corners between Turns 7, 8 & 9 are where people get into trouble. There are only a limited number of track day events at Sonoma this year and I want to run there as much as possible!