How long do the workers in the soy sauce factory work?

Does the subject want to ask, "How long do workers in soy sauce factories usually work?" Eight hours.

1, workers of Liupanshui Zhongshan Soy Sauce Factory go to work from 9: 00 am to 6: 00 pm, with an hour's break.

The working hours of Suqian Haitian Soy Sauce Factory are from 8 am to 5: 30 pm, and rest for one and a half hours. So the working hours are eight hours.