Lets take a hypothetic calculation.
Retired, net worth 30 million, 20 million invested, average return 3.5%.
10 million for the residential property to live, so no rent to be paid.
That amounts to a disposable income of 58330$, out of which 40% are 23330.
I need way less than that.
Did I have 30 mio. net worth, I could save more than 60%.