Sign up for the Sunday event along with your registration for VOI and you will probably get all the time you want in addition to the other times. COTA far exceeds any tracks in the past. Technical, long, fast, and nearly brand new !I'm not saying the layout isn't better than what I've heard of previous VOI's. Just that a 20 min session is way to short to really "get in a groove" on a new track once you take out the warm-up and cool-down laps. Plus, the Viper (mine anyway) isn't for w2w racing. It does get trailered to track and I run it on Hoosiers, but it's strictly a track day car. Way too stock to be competitive in a real race.
As far as these short stints you guys have to deal with with your local track days, that *****. Chin is who I did most of my track days with before going w2w, and it was always a 50 minute session, followed by 3 sessions of 45 minutes each, then a 1 hour "happy hour" open to all cars/drivers at the end of the day.
Maybe they have shortened their sessions though. I just looked at their schedule for Sebring and it's 4 sessions of 30 minutes and then the "happy hour". Road Atlanta was where I did most of my Chin events and they don't have the schedule posted on their website yet to see if they've shortened it there or not.