It can vary a lot. The average professional road race will be from 120km - 180km. That is for something like the Tour de France or any other tour. There are also one-day specials like: Paris Roubaix, which is a 250km race over the hard cobblestones of France. It goes for 5 hours.
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In the USA races can range from a 1/4 mile to 500mile Standardbreds race 1 mile, Quarter Horses for 1/4 Mile, Thoroughbreds are usually in the 5/8 to 1.5 mile range. Endurance races are usually 25, 50, 100 or 500 mile lengths with the majority of the horses being Arabian and part-bred Arabs.