system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do we work 5 days per week?

Someone somewhere must have deemed that humans have to work 5 days per week. Why not 3, 4, 6 or 7 for that matter?
gpt
It used to be 6, with the exception being Sunday for Christians and Saturday for Jews.

The additional day most likely only came with rising regulations and laws for the protection of employees. In some service industries, people still work 6 days.