35 Miss. Code R. § 101-4.4
When an appeal, objection or other document is required by statute, regulation or the Board to be filed with the Executive Director or with the Board within any number of days, the day of the act, event or default from which the designated period of time begins to run shall not be included. The last day of the period so computed shall be included unless it is a Saturday, a Sunday, legal holiday or any other day when the office of the Board is in fact closed, whether with or without legal authority, in which event the period runs until the end of the next day which is not a Saturday, a Sunday, a legal holiday or any other day when the office of the Board is closed. Legal holidays for the Board are found at Miss. Code Ann. § 3-3-7(1). When the period of time prescribed or allowed is less than seven (7) days, intermediate Saturdays, Sundays and legal holidays shall be excluded in the computation. Mailing does not constitute filing, and the time period within which the appeal, objection or other document has to be filed is not extended because of mailing.
35 Miss. Code. R. § 101-4.4