Google Maps now includes walking directions as well as driving directions. And so I can find that walking from Charlottetown, PEI to Atlin, BC would take 54 days and 9 hours. I’m also warned:

Use caution – This route may be missing sidewalks or pedestrian paths.

Perhaps more practical, it’s good to know that I should be able to walk to Halifax in 2 days once the oil runs out.