Having done a tiny bit of research on line...
It's looking like most races are about a mile long, in professional race tracks. I was seeing races anywhere from 5/8 of a mile to 1.5 miles.
I'd say the race has to be at least an eighth of a mile. That's 220 yards. I feel as though a horse needs at least that much distance to really begin to run and to begin competing against the other horses. My only constraint is that it might be a little too short, even.
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