Mississippi Code Title 49. Conservation and Ecology § 49-27-37

(1) The commission shall send a copy of any order in issuance, denial, revocation or suspension of a permit to the parties stated in Section 49-27-17, and such orders must be sent within ninety (90) days from the receipt of a complete application, or within ninety (90) days from an amendment to the application as provided by Section 49-27-11(2), in the case of granting or denying or thirty (30) days from the date of the hearing in the case of suspension or revocation, unless an extension is requested as provided in subsection (2) and approved by the commission.

(2) An applicant may request, in writing, additional extensions up to ninety (90) days for the processing of an application.