Massachusetts General Law chapter 149, section 100, provides that "no person shall be required to work for more than six hours during a calendar day without an interval of at least thirty minutes for a meal." Iron works, glass works, paper mills, letter press establishments, print works, bleaching works, and dyeing ...
Massachusetts Law allows employers of hourly workers to round clock time by 15 minutes, 6 minutes, or 5 minutes with the condition that “working time averages out over a reasonable period of time so that an employee is fully compensated for all the time he or she actually worked.”
The FLSA does not limit the number of hours per day or per week that employees aged 16 years and older can be required to work.
(c) The employer shall post 7 days in advance of the start of each week in writing a schedule that includes the shifts of all current employees at that worksite, whether or not they are scheduled to work or be on call that week. The employer shall update that posted schedule within 24 hours of any change.
The federal law that applies to all employees is the Fair Labor Standards Act, or FLSA. This law does not regulate how many hours you can work in a day.