I just did a TWS Open Track Day...WOW!
They run 55 minutes out of the hour. You show up, garages are first come, first serve. Unload your car, x2 check the direction and go until you get fuel starvation!
This is the best seat time/dollar event I can think of.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red