I think there's a paradox, that if you give too much to your employer, you burn out and then can give them nothing. Therefore, one should give the correct level of engagement , its not disengagement, but, being engaged enough to do the job well while still having a life outside work eg with family and friends. Its possible to work somewhere where your colleagues appear more dedicated than you, for example if they work the weekend and you don't. That doesn't mean you're less committed to your job, in fact it could mean you are more committed, because you know that working weekends is pointless as it leads to extra bugs thus being overall less efficient. In summary, work hard and diligently, while taking necessary breaks, getting required exercise and sleep, recovering properly if ill at ay time, and not working silly hours. so... a bit like a typical European ;)
Europe has great employee protection but it is not always this panacea either everywhere.
When I worked in Paris, I started at 10 am (to avoid rush hour on the subway), but rarely left before 7 or 8 (instead of 6) and it wasn't uncommon for me to stay until 11pm. I was "cadre" which means you need to deliver on tasks but get no overtime pay with the idea that workload is realistic but flexible: finish early and you're done, run late it's on you to deal with it. Needless to say the balance often tilted one way and not in my favor.
One reason was the culture at that company was to take many coffee breaks, long lunches, go for drinks after work and return to the office after etc. That means the days were pleasant and relaxed most of the time, but you made up for it by spending more time at work. I actually enjoyed it at the time, but I don't think I'd do now.
This was quite typical in my experience. Other companies would pay for overtime but only if you worked after 9pm (because 6 to 9 is for dinner). They'd cater pizzas during that time and folks would end their day at 9, and do just the 3h unpaid overtime while eating pizza in front of their pc.
Just saying, Europe has some great labor laws, but it's not all roses and rainbows either. Employers may still try to exploit you as much as they can within those laws (and sometimes by breaking it, I think lawsuits against employers (aux prudhommes) are a lot more common and employees win them quite often.)
