The legislative history of the exemption is explicit that the
exemption applies only to an employee who is employed ``primarily'' as
an announcer, news editor, or chief engineer. Thus the Senate Report
states: ``The exemption is specifically limited to those employees who
are employed primarily in the named occupations * * *'' (S. Rept. 145,
87th Cong., 1st sess., p. 37). No specific rule can be established for
determining whether in any given case an employee is employed
``primarily'' in the named occupations. Generally, however, where an
employee spends more than half of the hours he works in a workweek in a
named occupation, he will be considered to be primarily employed in such
occupation during that workweek. The answer will necessarily depend upon
the facts in each case.