Exactly what I wanted to say. I know it shows Korea as the 3rd most, but I feel like they should be higher on the list. Most don't report overtime and just do their work because it has become the convention and it wouldn't look good to their bosses.
So if say, the average South Korean man works 2500 hours (full time, crazy hours) and the average woman works 1000 hours (pretty crazy part time job) - the average would still be below 2000 hours.
I suppose one of the more interesting numbers would be total hours worked vs total work force (including unemployed) - it might be that eg Greece could maintain current productivity (or more likely increase, due to less strain pr worker) by going to a 6 hour work day and ~full employment.