“Enough” is too loose to be useful. It can moved up or down depending on the opportunity cost.
Many dying said they wished they didn’t work so hard. It contradicts with the Puritan work ethic. Who’s right?
It makes little sense to retire early on a shoestrings budget that requires you to substitute your own labor for hired labor.
Early retirement is expensive when you include the opportunity cost. It’s the opposite of frugality.