561—7.3 (17A,455A) Time requirements.
	 7.3(1) Computation. In computing any period of time prescribed or allowed by this chapter or by an applicable statute, the day of the act, event or default from which the designated period begins to run shall not be included. The last day of the period shall be included, unless it is a Saturday, Sunday or legal holiday; otherwise Saturdays, Sundays and legal holidays shall be included in computing the period.
	 7.3(2) Change. Except for good cause stated in the record, the presiding officer shall afford all parties an opportunity to be heard or to file written arguments before extending or shortening the time to take any action. When by these rules, or by notice given under them, an act is required or allowed to be done within a specified period of time, the presiding officer may, at any time, exercise discretion and may:
	  a.   	 With or without motion or notice, for good cause, order the period extended if a request is made before the expiration of the period originally prescribed or as extended by a previous order, or
	  b.   	 Upon motion made after the expiration of the specified period, permit the act to be done where the failure to act was the result of excusable neglect, except as provided in rule 561—7.13(17A,455A).
	 7.3(3) Mail. Any documents filed with the department by mail pursuant to these rules shall be deemed filed on the date of postmark.