I've worked primarily with Norwegians for most of my working like, but have also worked in projects in Sweden, Denmark and Finland - I've never come across this mythical 6-hour workday?
I don't know where they got that idea from, both in Denmark and Norway it isn't like that at all in most places. The grass is greener I guess.
Nobody has six hour workday and nobody thinks anybody has that. It’s only in the imagination of the writer of this marginally factual article.