<
http://www.londonancestor.com/bells/1849-horse.htm> has some
interesting data on long-distance horse riding. A sample: "Mr.
Thornhill, in 1745, ... rode from Stilton to London and back, and
again to Stilton, being 213 miles, in 11 hours and 34 minutes, which
is, after allowing the least possible time for changing horses, 20
miles an hour for 11 hours, and on the turnpike road and uneven
ground."
So magic would need to perhaps double the horse speed (either by
providing actual speed or endurance). That's within the realm of
plausibility.
--
David Dunham
Glorantha/HQ/RQ page: http://www.pensee.com/dunham/glorantha.html
Imagination is more important than knowledge. -- Albert Einstein