Re: Feeling at home
My female cat, Martha, was 'at home' in about 2 weeks after I adopted her.
My male cat, Jethro, has been indoors since January, and he's not there yet. He has his moments when he seems pretty relaxed, but he still gets spooked so easily that he becomes uncertain of his surroundings easily. Hopefully with time, that decreases so he can relax.
Doesn't help that we moved in the last month, with a pit stop at my parents for a couple weeks, so he lived in 3 places within a month. Probably set him back a little.
Now we have new furniture that he has to get used to, as well. (Both cats have quickly found out they can sit under the reclining chair by going under the flap in the back, though....go figure!)