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Japan, Canada and Europe. NASA astronaut Mike Lopez-Alegria has flown the longest U.S. space. station mission to date, at 215 days. Valeri Polyakov, a Russian cosmonaut, spent 437 days in. space during one mission. A space shuttle crew is typically five to seven crewmembers. We have. carried as few as two and as many as eight at one time, and space shuttle missions have been as. short as two days and as long as 18 days.
But every crew that resides on the International Space Station provides us information that we use to adjust our protocols and that extends that period of time. The longest contiguous amount of time a human has spent in space is 437 days. That was done by Valeri Polyakov, almost twenty years ago. That was his second flight. His first was 240 days long. Sergei Krikalev, over six flights, has spent 803 days in space. Space is a harsh environment for humans.