I'm European and I'm about to accept a tenure-track position in the US where I will come up for tenure review after 2 years (i.e. get tenure after 3), as I have already spent a number of years in a comparable position.
While negotiating, I was warned that I must obtain permanent residency in the US before they can grant me tenure, but they couldn't tell me whether the 3 years of my initial contract will be sufficient time for doing so. Apparently, this 3 years can't be extended unless I get tenure, so I better manage to obtain a green card within 3 years. This somewhat conflicts with what my US-based colleagues assured me, namely that the process of getting permanent residency is quite straightforward for professors.
How long did it take for you (or your colleague) to get permanent residency through the "Outstanding professors or researchers" (EB-1B) category?