In computing any period of time under these Rules, the time begins with the day following the act, event, or default, and includes the last day of the period, unless it is a Saturday, Sunday, or national legal holiday. When the period of time prescribed or allowed is less than seven (7) days, intermediate Saturdays, Sundays, and holidays shall be excluded from the computation.

Whenever service of a document has been made by mail in accordance with § 201.43 three (3) days shall be added to the prescribed period for answer.

Applications for extension of time for the filing of any document shall set forth the reasons for the application and may be granted upon a showing of good cause on the part of applicant. Answers to such applications are permitted.

Except as prohibited by law, for good cause the Administration, or the Presiding Officer with respect to matters pending before him, may reduce any time limit prescribed in the regulations in this part.

Applications for postponement of any hearing date may be granted upon a showing of good cause on the part of the applicant. Answers to such applications are permitted.