For the most part there's no peer pressure from my colleagues (both Japanese and non-Japanese), but the pressure comes from the senior management. My probation period was extended because of me leaving on time everyday, even though all of my tasks are completed.
I left the company for a different reason though. I applied for my honeymoon leave and got rejected twice.
(This little story is by no means a representation of all Japanese companies or all Japanese, just a retelling of my experience working for a Japanese company)
The fact that they monitor 1-min deviations from prescribed time really seems outlandish to me. Makes me view my chill startup job (45-55 hours a week) in a new light.