Under the Factory Acts, the maximum number of weekly hours a worker should work has varied over time and by specific regulations. Here's a general overview:

• Historical Context: The Factory Acts, primarily in 19th-century Britain, aimed to improve working conditions, especially for women and children.
• Early Regulations:
  • Early acts, such as the Factory Act of 1833, focused on limiting hours for children and young persons. For instance, children aged 9-13 were often limited to 48 hours per week.
  • The Ten Hours Act of 1847 limited women and young persons to a 10-hour workday, effectively capping the workweek at 60 hours (10 hours a day for six days).
• Later Developments: Over time, further acts continued to refine and reduce the maximum working hours. However, the specific maximum varied based on age, gender, and the type of work.

Please specify the country and time frame for more detailed information on the specific maximum weekly hours under particular Factory Acts.