Working days
Working days means Mondays through Fridays but shall not include Saturdays, Sundays, or Federal holidays. In computing 15 working days, the day of receipt of any notice shall not be included, and the last day of the 15 working days shall be included.
Source
29 CFR § 1903.22
Scoping language
The definitions and interpretations contained in section 3 of the Act shall be applicable to such terms when used in this part 1903.