>>111888 I went looking for WT climbs, the longest Tour climbs they do these days are Mont Ventoux (~55 min) and Col de La Loze (~60-70 min depending on the version). Though one could maybe consider Télégraphe + Galibier (~85 min) as one climb.
Outside the Tour there's Finestre (~60 min) and Thyon 2000 (~58 min).
A few years back, Val Thorens (~77 min) was a massive one.