It may be in one of those posts referenced above- but the first "Six Day Race" was a guy riding a 1,000 miles on a penny-farthing. So that's been done, too. Of course, that was on a track, so no hills do deal with, just crank along at 13 mph for 16 hours a day.
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"be careful this rando stuff is addictive and dan's the 'pusher'."