

It’s pretty quick. Insects come back in about two years, although it can be a little weird- you may get massive population growth of bugs you aren’t thrilled about ( we had a year of millions of earwigs first)
then predators (one year was baby lizard mania )
Bumblebees really took off about 3 years in. Birds too.
The secret to extending your flexibility for getting up and down as a lazy person is a low platform western bed or a Japanese bed. It makes getting up and down a part of your routine.
Also overall for foot flexibility and knees health barefoot walking and barefoot shoes make a huge difference. I use a treadmill barefoot a few times a week, and barefoot shoes when I can.