Well, I had an interesting experience as one of few westerners in a western branch of aJapanese company that had 200+ of Japanese staff. We westerners left every single day at 5pm (unless there were real technical emergencies). All of the Japanese had to stay to approximately 8pm. Sometimes longer.

Despite the fact this is actually illegal in the "host country" they still did it with no overtime paid(or claimed) . I had many Japanese friends in this company over the years and I knew they would much prefer to be off at 5pm as we were, but every time we talked about it it turned out they are 100% powerless to change it. The company not only provides a prestigious job (which was extremely important), but also provided housing in the host country, a visa, good schools for the kids etc. Additionally, every time we discussed it I got an impression they really have it easy here in comparison to how much they would have to work back in Japan. So all those people really didn't want to be sent back.

On the rare occasion when I had to work on a weekend and overnight, HR contacted me asking me to fill the overtime form :-o

I write this not as a complaint. I considered it one of my best jobs and if not that I wanted to be in a different role I would still be there, but even now years later I still remember having this weird feeling of there being a very real discrimination against other people on the basis of culture and not being able to do anything about it.