I was talking to my dad and sister, and my dad shared that he had heard advice about taking a month off work as a "trial retirement" (as he approaches traditional retirement age).
I promptly piped up and said that one month might not be representative, because in your first month off from work, you might need that time just to decompress, and plus it may take awhile to ramp up to regular activities: set up a volunteer schedule, find others who are free during the day, sign up for an exercise class, etc.
My sister laughed, "What are you? Some kind of retirement expert?"
No, I've just been reading a lot about (early) retirement lately!