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Answer:

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.

Explanation:
NASA long term missions have typically been 3-5 person crews, and the crews have been put in isolation for the requisite several months during training; those who can't handle it have been weeded before flight.

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