Mir was occupied continuously from 1989 until August 1999. There was then an interlude until November 2000 when permanent occupation of ISS began.

It's a shame in a way that Mir didn't hang on for an extra 18 months

And just like that, we've been set back by 10 years in waiting for a chair at the Milky Way Galactic Federation of Planets, which requires a 100 year continued presence of humans in space.

What kind of Galactic Federation defines their requirements in terms of time intervals defined by the orbital period of some random planet using numbers that are nice and round but only in some alien base?

It's mostly a coincidence. It's defined as three times the half-life Rhodium 101.

A Hollywood scriptwriter federation.

In all fairness, Mir soldiered on way longer than it was designed to, and in the last year or two had basically constant issues.

Skylab is pretty cool, occupied for half a year in the 1973, much earlier than I had known we had people hanging out in orbit

https://en.wikipedia.org/wiki/Skylab