How did I walk 37 miles in 19 hours?
How did I bike 90 miles in 11 hours?
...
Inhale in nose, exhale in nose 4x
Inhale in nose, exhale in mouth 4x
Inhale in mouth, exhale in nose 4x
Inhale in mouth, exhale in mouth 4x
And repeat.

You just need enough food and water and a pair of soft and hard soled shoes.