NASA Astronaut Peggy Whitson on 24 April 2017 set a new US Record for most cumulative 650 days spent in space. With this Whitson surpassed Cosmonaut Jeff Williams record of 534 days, 4 hours and 48 minutes aboard the International space Station (ISS). With the recent extension of her stay at the ISS, the Expedition 51 Commander has five months to rack up another record.