Mississippi Code Title 1. Laws and Statutes § 1-3-69

When publication shall be required to be made in some newspaper “for three (3) weeks,” such publication shall be made once each week for three (3) successive weeks, and the time within which the noticed party is required to act or within which the noticing party may proceed shall be computed from the first date of publication. This rule shall furnish a guide for any similar case, whether the time required be more or less than three (3) weeks.