Yes, it could be more. I'm actually thinking about reducing my working hours. Could you elaborate on which assumptions seem unrealistic to you? I tried to list them as honest as possible, but for sure I might have overlooked something. The estimated free time aligns quite well with my daily perception (also, I could see 'staying healthy' as free time, because I go rock climbing and thats just something I love to do as a hobby).

On second thought, "very unrealistic" was harsh. I (or anyone) could nitpick a few hours per week here and there but nothing significant. You are right that it's really just about current life situation. As a married homeowner, my responsibility time is much higher, hah.

No kidding! I feel like my wife & I get somewhere between 1-2hr/day of discretionary time, and it's not in large blocks most days... and it includes things like calling the utility provider to figure out a billing problem, vacation & event planning, chatting with neighbors/friends, and anything else that isn't a natural part of the "committed parent + homeowner" categories.

If you include sleeping as a responsibility.

Absolutely. I definitely would not do if I didn't have to!

It distorts the statistics a bit, though. You could have 75% of your waking hours be free time and still calculate that you're spending half your time on 'responsibilities'.