33 C.F.R. § 20.306 – Computation of time.

(a) We compute time periods as follows:
1. (1) We do not include the first day of the period.
2. (2) If the last day of the period is a Saturday, Sunday, or Federal holiday, we extend the period to the next business day.
3. (3) If the period is 7 days or less, we do not include Saturdays, Sundays, or Federal holidays.
(b) If you were served a document (by domestic mail) that requires or permits a response, you may add 3 days to any period for response.

(1) You may request an extension—
Table 20.306(c)(1)—How to Request an Extension
If the response period— By—
Has not expired Telephone, letter, or motion.
Has expired Only by motion describing why the failure to file was excusable.

Table 20.306(c)(1)—How to Request an Extension
If the response period—	By—
Has not expired	Telephone, letter, or motion.
Has expired	Only by motion describing why the failure to file was excusable.

(2) You file your request as follows:

Table 20.306(c)(2)—Where to File an Extension Request
If—	Then you file your request with the—
An ALJ has not been assigned	Hearing Docket Clerk.
An ALJ has been assigned	ALJ.
Your case is on appeal	Hearing Docket Clerk.