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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.
Kelly will stay twice as long as any U.S. astronaut has ever stayed on the space station, giving scientists a chance to study how the human body responds to long-duration space flights. On Earth, scientists will perform parallel studies on Scott Kelly's identical twin brother, retired astronaut Mark Kelly.