Many years ago I did a 24 hr event and covered 320 miles in that time.I was not into road riding and did it on the MTB with slicks fitted and a lower stem. 500 miles non stop is quite feasible for someone who is used to long distance riding and is fit enough. Not that I would ever want to sit on a saddle for that length of time again
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How long was I in the army? Five foot seven.
Spike Milligan