I live in France and worked for 35 years for the French Space Agency. I'm still doing part-time consultancy.
When I started working here back in the 70's, we worked from punch-in to punch-out. That was it.
The lunch break, was just that. We usually went to eat as a team. If someone started talking shop at the table, he/she was penalized to pay a bottle of wine.
The official work-week is 35 hours (32 for civil servants). This being said, guys in private companies work 40-50 hour weeks without extra pay.
Nowadays, companies provide laptops and cellphones to employees knowing they will be available 24/7/365. This disrupts family/personal life as there is a subtle and implicit obligation to respond to e-mail and texts. It can, in certain cases, run into harassment.
The law, as many others, will be hard to enforce but, it does exist and it should help protect prime-time with the family.