This is measuring household not individual... Needs context then... How did average working hours per household change during that period?
Not sure how to square that with the fact that there’s been low productivity growth since 2008.
https://ec.europa.eu/eurostat/databrowser and either search or use data code tps00071
That is to say, due to more work opportunities more people have gotten jobs that count towards measured work hours and GDP. Including households who used to have one person working jobs that count towards metrics now have two.
I don’t have numbers for this though, just an informed guess.
So it's not divided per household.
But the point about working hours remains.