Wow, that's an interesting article! Esp. the original data of a new study where they counted the working hours in many countries.
It's nice to go through the own country and see how much your people work.
The problems of working too much are of course well known:
The problem is that this 'long hours' culture likely defeats the purpose of getting more things done, or at least puts a very hefty price on doing them. There is plenty of evidence that working overtime reduces your productivity, and makes you feel and actually be less healthy. It also make you more likely to develop a whole range of diseases.
The study can also compare too long working hours with being drunk:
For instance, if you woke at 8 a.m. and were still awake at 1 a.m. the next day (that is, if you had been up for 17 hours straight), your physical performance would likely be worse than if you had a blood alcohol concentration of 0.05%. This the level that an average 73 kg male would get if he had drunk two 355ml cans of beer. That’s right, you’re drunk on overtime.
At the end the solution is to (try to) work not too much. The 40-hour-work-week is something worth accomplishing.