The EU is already lagging in the developed world in productivity
Why not put a few businesses out of business and raise the cost for those remaining.
An amusing graph certainly. I think people in the US work more than 6% more in terms of hours, and and in many places in Europe it's actually illegal to work overtime without compensation (aka, multiplier to pay or extra time off). That on top of generally having more than 6% more time off due to government mandated vacation requirements.
I think a more significant measure is productivity / hours worked, because especially in the non-manufacturing societies (or specialist manufacturing) the west works in, killing/firing/replacing your skilled work force is a bad idea in the long term.