Question 1.
1. Complete ownership of the apartment.
You mean, of course the freedom to install or modify anything you want. But if you "own" it, it must be a condo or townhouse. Of which both are subect to the association limitations.
If it's as you say, why specify that it's an "apartment?" At that point, it must be a free-standing house or you own the duplex or the apartment building or the whole condo/townhouse.
What am I missing here?
3. ACcess to the room for gardening/other purposes.
How about meat?
5. Heating plant?
Maybe I'm missing the thrust of your question.
Are you simply asking, if all needs were supplied, how long could you be a hermit?
If so, for myself, I've been stuck in my own apartment for four days due to crappy weather. I could step out on my balconies, but that was it. Social contact was not much of a problem because other people would also stick their noses out on their balconies, too. And I still had a phone and radio and TV and lotsa toys and projects to play with.
Terry, 230RN