How many hours is the working system from 8:30 am to 5:30 pm?

Nine hours working day. 8: 30 am-5: 30 pm, with a total of 9 hours in between.

The eight-hour work system is eight hours from 9 am to 5 pm.

The eight-hour working system is a working system with a working day length of eight hours stipulated by national laws. At present, all countries in the world generally implement the eight-hour working system.

The eight-hour working system is the result of the long-term struggle between the working class and the bourgeoisie. In the early days of capitalism, the working class began to strike and demonstrate for the eight-hour working system.