The longest & arguably the most dangerous walking route on earth, is from Cape Town (South Africa) to Magadan (Russia).
No need for planes or boats, there are bridges.
It's 22.387 miles and it takes 4,492 hours to travel.
It would be 187 days walking nonstop, or 561 days walking 8 hours a day.
Along the route, you pass through 17 countries, six time zones and all seasons of the year.
NB:You won't make it, in Africa wildlife or rebels will get you, Middle east some terrorist group will kidnap you and in Russia snow and extreme cold will finish you off. Just stay home! π€£ π€£ π€£