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

The origin of the idiom "all hours" are rooted in the concept of time and the measurement of hours. The phrase evolved as a way to describe activities or situations that occur without restriction or limitation regarding specific hours of the day or night. It is often employed to describe instances where someone is constantly engaged in a task, available for assistance, or working diligently without regard for normal working hours.