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Dear Murietta, California:
Neither the Fair Labor Standards Act (FLSA) nor California laws have a required time off between shifts. Here is information from California's Division of Industrial Relations, "Q: Are there any required rest times between work shifts -- i.e. an employee works from 7:00 a. m. to 7:00 p.m. -- how soon can this employee be called back? There is no limit on when an employee can or cannot be called back to work. A: Employers are cautioned, however, to keep in mind safety concerns for employees to avoid injuries due to fatigue." Here is a link to the website with this information: http://www.dir.ca.gov/DIRnews/1997/otfaq.html
However, there are certain professions - like commercial truck drivers and airline pilots -- who do have required breaks between shifts.