I've walked about 12-15 miles a day for >2 months now, while homeless. I found myself unable to perform manual labor on top of the walking for any sustained amount of time. Extended fatigue takes over.
For a sedentary/desk job, I suspect that maintaining this quantity of walking daily would be feasible, and beneficial, long term.
For a sedentary/desk job, I suspect that maintaining this quantity of walking daily would be feasible, and beneficial, long term.