A New LongDuration Spaceflight Record on This Week NASA

the record for the longest continuous duration spent in space was held by Russian cosmonaut Valery Polyakov. He spent a total of 437 days, 17 hours, and 58 minutes aboard the Mir space station during a single mission from January 8, 1994, to March 22, 1995.

Please note that spaceflight records can change over time as new missions are conducted, and astronauts and cosmonauts spend longer durations in space.