I don’t think this is quite right - the “hierarchy of needs” pyramid is misleading. Self-actualization is fleeting just like physical care (eg meeting basic needs) is fleeting - if you stop doing it, things go downhill quickly, and so you’re always doing it at least a little bit.
While a lot of people frame self actualization as what they would do if only all other needs are met, they really should be thought of as needs you must meet to feel fulfilled. Could be as simple as reading a good book, getting out into nature or cooking a nice meal. Anything that you get value from ticks the box for a little while.
I think after 18 months or so you will have a good feeling for what you bought. There will still be things to do. There will ALWAYS be things to do (some of which will be very expensive). But as far as coming to terms with exactly where everything is, what the quirks are, and whether you can live with them, you need all 4 seasons and a bit.