For those who just read the headline, his isn’t walking all at once.

He walks as much as he can that year, then either stays in that area for a while or goes to another country.

Each time he restarts from the point he left off at.

He also skipped a few years entirely, after the 2008 financial crisis and during the Covid pandemic.

I suppose if Russia had let him be in the country for more than 3 months at a time, he might have been able to do it all at once.