I came through at the end of my 4th lap at 1hr 55 and they pulled me over so I guess if you weren’t on your 5th by 1hr45 it was 4 Laps for a lot of us.
Like other comments on starting position I think it made a big difference as it took me at least a lap until things thinned out enough to do a reasonable amount of overtaking.
If I’d realised they’d be the bottlenecks I’d have hammered it more on the first climb from the start as I think as long as you maintained your speed your position the top pretty much dictated where you ended up.
Hopefully top 100 next year.