Lately I've been walking 20 km per day (~12.5 mi). Takes at least 3.5 hours. I try not to listen to any audio -- I just let my mind wander. To step it up a notch, I put on a weighted backpack (i.e. ruck). I'm typically carrying 30 lbs, sometimes 50. This raises the heart rate and roughly doubles the caloric burn. Low injury risk, too. Michael Easter's book "Comfort Crisis" has a nice chapter on rucking. I just wish i…
This is crazy distance, keep it up.