I am specfically thinking at the exit of turn 4 and specifcally Big Rock (turn 6), off camber, down hill, left turn - Armco track side.
Exit of Temptation (turn

Deliverance (turn 9) Armco at track side left.
Turn 12B , lots of high sides here.
Turn 16, left into the gravel pit,... front goes light or wheelies, just as you turn.
Wilsons (turn 20) on the front straight.
Turn 1, if it goes wrong at speed you are right into the Armco.
Anyways you get the idea. Most of us mere mortals require 2 full track days to figure out which way the corners go, and how to get relatively fast safely. I tend to do the odd Pro6 day and the DOCC rally's at the track. Having worked the crash truck I can say that when it goes bad at Calabogie it can be very bad.
So I would rather have more practice than a 3 hour Endurance Race.
That's my 2 cents.