Page "Horse racing" Paragraph 44
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The length of an endurance race varies greatly.
Some are very short, only ten miles, while others can be up to one hundred miles.
There are a few races that are even longer than one hundred miles and last multiple days.
These different lengths of races are divided into five categories: pleasure rides ( 10 – 20 miles ), non-competitive trail rides ( 21 – 27 miles ), competitive trail rides ( 20 – 45 miles ), progressive trail rides ( 25 – 60 miles ), and endurance rides ( 40 – 100 miles in one day, up to in multiple days ).
Because each race is very long, trails of natural terrain are generally used.
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