If in any workweek an employee is covered by the Act and is not
exempt from its overtime pay requirements, the employer must total all
the hours worked by the employee for him in that workweek (even though
two or more unrelated job assignments may have been performed), and pay
overtime compensation for each hour worked in excess of the maximum
hours applicable under section 7(a) of the Act. In the case of an
employee employed jointly by two or more employers (see part 791 of this
chapter), all hours worked by the employee for such employers during the
workweek must be totaled in determining the number of hours to be
compensated in accordance with section 7(a). The principles for
determining what hours are hours worked within the meaning of the Act
are discussed in part 785 of this chapter.