049-15 Wyo. Code R. § 15-6
In computing any time period set forth in these rules, by applicable statute or order of the Hearing Officer or Director, the day of the act, event or default from which the designated period begins to run shall not be included. If the last day of a designated period falls on a Saturday, Sunday or legal holiday, or when the act to be done is the filing of a paper and weather or other conditions have made the place of filing inaccessible, then the period runs until the end of the next business day. For time periods of ten (10) days or less, the period of time shall be ten (10) business days. For purposes of this section, "legal holiday" includes any day officially recognized as a legal holiday in this state by designation of the legislature or appointment as a holiday by the Governor.
049-15 Wyo. Code R. § 15-6