Typically there is no limit on the number of days in a row that an employee can be scheduled to work (the exceptions being for truck drivers, airline pilots, some medical personal, and the like). That having been said, restrictions on the number of days the an employee can be made to work may exist under the terms of an employment contract or union agreement. Also, such action must not be the result of any form of legally actionable discrimination or retaliation. If not then, as an "at will" worker, your choices are to work the schedule, complain and/or take time off but risk termination, or quit.