Frank Rubio has inadvertently set a new record for the longest time in space by an American. The NASA astronaut who returned to Earth on September 23, 2023, was supposed to have been at the International Space Station (ISS) for 180 days. In reality, he stayed there for 371 long days. Rubio’s time in space surpasses Mark Vande Hei’s US spaceflight record of 355 days set in 2022. Russia holds the world record of 437 days, set in the mid-1990s.