 I'd have to go back and look, because their records get all mixed up with the littler space stations they had back in the 80s and 90s, but well over a year. And, of course, famously, Scott Kelly went up, and his brother, his twin brother, stayed down on Earth, who was also an astronaut, but he was Earthbound. And when Scott came back, they were able to compare their medical conditions, and they really got a much clearer picture of what happens to you when you spend a lot of time in that environment. I think I'd get stir-crazy after two days.