Looking to try this tomorrow as a 2w/kg ride. Any idea expected duration?. 4 hours? More?
It will be a zone 2 custom workout
4 hours sounds reasonable. I did 3.5 hours at 2.5wkg. 
… and was dying a (very) slow death from half way up the Alpe all the way to the end 
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It does sting a little does the 4HM…
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