Those astronauts spend less than 216 days on that station, and require extensive physical therapy to recover (which they never fully do) when they get home. The

Those astronauts spend less than 216 days on that station, and require extensive physical therapy to recover (which they never fully do) when they get home. They’re also not a sustainable population, even with supplies and reinforcements from Earth. The longer they spend up there the more their long-term health suffers, and there’s no reason to believe that they could survive for years, never mind breed and sustain a population even with supplies. Pointing to the ISS as an example of how close we are to self-sufficient colonies betrays a total lack of comprehension about the challenges such an endeavor faces.