bankers' hours

What is the origin of the idiom "bankers' hours" and when to use it?

The idiom "bankers' hours" originated in the early 20th century in the United States. It reflects the typical working hours of banks during that time, which were shorter compared to other businesses. Over time, "bankers' hours" expanded beyond its literal meaning and started being used more broadly to refer to any business or organization with a shortened or restricted work schedule.