Employment Law Questions? Ask an Employment Lawyer.
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Can you please provide more background information of the circumstances surrounding your questoin?
There are no laws which provide a "maximum" amount of time an employee can work in a week.
The facts you describe suggest that you are an "at will" employee. This means that your employer can schedule you whenever s/he wants. Failure to work the scheduled time can result in discipline, up to and including discharge.
It may seem to be unfair or unjust. However, that is the very nature of "at will" employment. You work at the will (or whim) of the employer.
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