* Foreigners get more leeway. I have colleagues that do a strict 40 hours/week.
* The overtime culture isn't strictly enforced. It comes about organically. Your team agrees to deliver a task with a tight deadline. You can go home early, but your colleagues will unquestioningly pick up the slack. Instead of them leaving the office at 10pm, now they stay to midnight. It is easy to feel guilty about leaving at reasonable time.
* There is a lot of praise and admiration for the employees that demonstrate hard work.
* There seems to be an unwritten rule that you stay till your boss goes home. Teams where the boss works a reasonable schedule, also seem to work reasonable hours. If you have a workaholic boss with no personal life then you are in trouble.
* For a lot of young Japanese it appears their colleagues are their only social circle.
* There is a lot of after-work demands on your time. It is common to have work-related dinners and drinks.