29 CFR § 459.2 - Additional time after service by mail.

Whenever a party has the right or is required to do some act pursuant to these regulations within a prescribed period after service of a notice or other paper upon him and the notice or paper is served on him by mail, five (5) days shall be added to the prescribed period: Provided, however, That five (5) days shall not be added if any extension of time may have been granted.