16 miles. I was hungover, stepped out of my flat for a can of coke, and then just didn’t stop walking until my headphones died. Took the train back home.

15-25 kms Monday to Friday, every week for the past 8 years. I’m a meter reader, I get paid to walk. The most I did in 1 day was 33 kms. I’m in Australia so 40 degrees centigrade (over 100 F) are not uncommon. I walk whatever the weather.