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81.770 shackles is about one-and-one-tenth times as long as The Kentucky Derby
In other words, it's 1.11505 times the length of The Kentucky Derby, and the length of The Kentucky Derby is 0.896821 times that amount.
(Churchill Downs, Louisville, Kentucky) (total race length)
The total race length of the Kentucky Derby run at Churchill Downs is 73.33330 shackles. First run in 1864, the Kentucky Derby is one of the oldest continuously-running sporting events in America, almost two years older than the Westminster Kennel Club Dog Show
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