Scotty bought a boat so clearly has a lot of time.
...Or is preparing to having some in the future.
In any case, Kirk had time for a log cabin (but not for a family) some years before ST2, according to ST:GEN. And Kirk's cabin is on Earth and supposedly not mobile, while Scotty might have bought a boat he can try out on every planet his starship visits.
Uhuru seems to be teaching.
Umm, how so? And what subject?