Mississippi Code Title 81. Banks and Financial Institutions § 81-5-97

The commissioner of banking and consumer finance may, from time to time, adopt and promulgate rules regulating banking hours, and such rules shall have all the force and effect of law. In addition thereto, the commissioner may permit a bank or bank branches to close for business at such time or times during the week as the commissioner determines will not prevent the rendering of proper and reasonable banking service to the community and trade area in which the bank is located. Unless emergency circumstances exist as determined by the commissioner, the commissioner shall not authorize any bank to close for more than two (2) whole days during any week, state and federal legal holidays and Sundays excepted. However, in the event any state or federal legal holiday shall fall on a Saturday, then banks may observe the preceding Friday as a legal holiday, or if such holiday shall fall on Sunday, then banks may observe the next following Monday as a legal holiday.