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651.490 hours is about three-and-a-half times as long as The Apollo 11 Mission
In other words, it's 3.33568 times the length of The Apollo 11 Mission, and the length of The Apollo 11 Mission is 0.299789 times that amount.
(1969) (total mission length)
The first trip by humans to the surface of the Moon, the Apollo 11 Mission began with the launch of the spacecraft from the Kennedy Space Center in Florida on July 16th, 1969 and concluded with the return of the command module on July 24th, 1969 — a total mission time of 195.310 hours. The total time spent by astronauts Neil Armstrong and Edwin "Buzz" Aldrin on the Moon's surface was 2.611110 hours.
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