10h 29min, jul 27, 1979 y - Ali's record in boxing was 56 wins, 5 losses, and 37 knockouts.
Description:
http://www.foxnews.com/sports/2016/06/04/muhammad-alis-boxing-record-56-wins-5-losses-37-knockouts.html
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Date:
10h 29min, jul 27, 1979 y
Now
~ 44 years ago