Off-topic question no LBC

["Mark Hooper" <mhooper@digiscreen.ca>]

Does anybody have an idea of the maximum sustained daily distance that a horse 
and rider can cover?

I have often heard references to the fact that a man can carry food and run 
longer and farther than a horse (or at least a man on a horse). Due to the 
amount of time herbivores must spend grazing, it sounds plausible over the long 
term, but perhaps also wishful thinking. Any supporting/disproving knowledge 
out there?

Mark