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The length of the race, 500 miles.

When the race was founded in 1911, it was intended as an endurance race. Back then, the top speed for the typical car in the race was about 20-25mph. At that speed, it would take 20 hours to complete 500 miles! With technology, faster cars and things like actually paving the track, the race got faster and faster... with current speeds closer to 230mph, the race completes in less than 2 hours!

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11y ago

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