NASA astronaut Suni Williams has retired after 27 years, concluding a career that included three missions to the International Space Station and a total of 608 days in space—the second-longest cumulative time in NASA history.

Williams, a former Navy pilot, joined NASA in 1998 and logged 62 hours and 6 minutes of spacewalks, the most by any female astronaut and fourth-most overall.

Her final mission in 2024, initially planned for one week, stretched to 286 days due to issues with Boeing’s Starliner capsule, requiring a SpaceX Dragon to return her and her crewmate safely.

Williams praised the experience despite its challenges, noting her body adapted well due to previous spaceflights, NBC News has reported.

NASA Administrator Jared Isaacman called her a trailblazer who helped shape human spaceflight and pave the way for commercial missions to low Earth orbit.