More power to him! I find it hard to get large blocks of quiet time now having three kids, but that's life :-) My dad was a lot like him, though, was coding or hacking around on ham radios most of the day well into his 60s.

Yeah, of course, that goes with it: he doesn't have kids, and he has money.

But, again, I'm in the same boat, and 4 hours of coding is already plenty for me.