I'm not sure you can really do this kind of math when it comes to knowledge/creative work. One could argue that the 600 foot round-trip walk (vs a 60 ft walk),

I'm not sure you can really do this kind of math when it comes to knowledge/creative work. One could argue that the 600 foot round-trip walk (vs a 60 ft walk), which is almost an eighth mile, contributes positively to your health and ability to concentrate by getting the blood flowing and boosting your seratonin and dopamine levels. I.e. the result of taking extra 3 minutes translates into higher $ productivity for the rest of the day.