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As of October 2023, the record for the longest single stay on the International Space Station (ISS) is held by Russian cosmonaut Valeri Polyakov, who spent 437 days and 18 hours aboard the station during his mission from January 1994 to March 1995. His extended stay was part of a study on the effects of long-duration spaceflight on the human body. This record remains unmatched in terms of continuous time spent in space.

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3w ago

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