As per the Factories Act, an employee can work a maximum of 48 hours in a week, i.e., 8 hours in a day and for 6 days max. After every sixth day, there must be a holiday for that employee. So, if this is followed, assuming 4 weeks in a month, they need to work 192 hours in a month.
However, for the maximum working hours, there are different concepts under the Factories Act. For certain industries specifically mentioned in the schedule attached to the Factories Act, there is an exemption of maximum working hours, i.e., 48 hours in a week and 8 hours in a day. In that case, the employee can work for more than one shift, i.e., for 16 hours in a day (continuing 2 shifts).
I hope that I have cleared your doubt.
Regards,
Atul Malve