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At the end of this, Kelly will have a total of 522 days in space (adding on a day for accumlated hours spent), which will beat out Mike Fincke's total record of 382 days in space. Because he's been on a Hubble servicing mission, Kelly has also flown higher than a majority of astronauts since the Apollo era ended.
On April 24, Whitson will have spent more time in space than any other American astronaut, surpassing the current U.S. record of 534 days held by NASA's Jeff Williams, 59.