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@Nef
i've heard that people who do that thing where they cycle a stage of the TDF have found it harder than a marathon.
i'm probably in the minority here as i've run a marathon but not done a century (done 110km with lots of gear and food though). i'm not the fittest and i did the marathon in 4:58, not the greatest time i know. depends what bike you're on as well i guess, 100 miles on a full carbon triathlon bike is going to be very different to 100 miles on an mtb or fixed gear for example.
so in answer to your question, i've got no fucking idea.