The workweek is the unit of time to be taken as the standard in
determining the applicability of an exemption. An employee's workweek is
a fixed and regularly recurring period of 168 hours--seven consecutive
24-hour periods. It need not coincide with the calendar week. If in any
workweek an employee does only exempt work, he is exempt from the wage
and hour provisions of the Act during that workweek, irrespective of the
nature of his work in any other workweek or workweeks. An employee may
thus be exempt in 1 workweek and not in the next. But the burden of
effecting segregation between exempt and nonexempt work as between
particular workweeks is upon the employer.
