The amount of time the station spends in orbit isn't relevant, the amount of time a person spends in orbit for an unbroken stretch is what's relevant. Three of the top five spaceflight duration records were set on Mir, including the top two (437 days and 379 days.) Nobody even thinks of getting close to that top Mir record anymore because it is already known that it fucks people up.
> The amount of time the station spends in orbit isn't relevant,
The people on ISS were doing a multitude of scientific programs during that long time. That's important. Just like you wouldn't say that Hubble already seen everything and JWST isn't needed.
