Around Germany and Greece there were other countries. They went by names like frugal four and PIIGS. They forced "austerity" and stricter working hours onto indebted countries to save their own banks.
The colours on this map show well that northern "productivity" is not about working hours, but about other topics that did not get addressed. Among these topics are also tax heavens (think the Netherlands) and money laundering (think Austria's special relationship with Russia).
So it was nothing more than poor political leadership without vision.
This graphic is not correct at least concerning Switzerland where a full time work week is 41 hours.
So no one in Switzerland has a part-time job?
No. Everyone there from 9 to 99 has a job and works full time.
The chart isn't about contracted hours or official full time work week regulations, it's about effective worked hours.
It's a slightly out of context report on a partial step of how productivity and overtime are counted, from what I understand.
How did you get to 41?
Working there