In California, overtime is defined as: Any and all time spent working that is in excess of eight hours per day and 40 hours in any one week for most trades.  Some trades require overtime to be paid in excess of 7 hours.  In addition, each trade will identify how many hours can be paid at the Saturday overtime rate and how many hours must be paid at the Sunday / Holiday rate.  For more specific overtime requirements, please consult the California prevailing wage determinations specifically as overtime requirements differ by craft or trade.