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4200/47000 is a tough one
I've now spent loads of time on it and put the parcours in properly.
As I worked through it I saved loads of time and took out loads of climbing. Then I had to add loads back again as I found other stuff. And I've got to 4200/46000.
I don't see it changing massively from there - unless I've missed something significant. So it's one of the hilliest routes as well as the longest - up there with 2015 for length (which was pretty flat) and almost as hilly as 2016 (which was a lot shorter). On that basis it could well be the hardest route so far.
4200/47000 is a tough one