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From the IWC... "Each workday an employee is required to report to work, but is not put to work or is furnished with less than half of his or her usual or scheduled day's work, the employee must be paid for half the usual or scheduled day's work, but in no event for less than two hours nor more than four hours, at his or her regular rate of pay." - http://www.dir.ca.gov/IWC/
Which at restaurant rates isn't too much....