Not to split hairs,
The officer at INM will almost always mark 180 (maximum) on your FMM form in the space indicated "dias" unless you present a Visa.
Even thought the website says 6 months, the officers computer displays the number of days between two dates. So be aware of your dates.
![[Linked Image]](http://www.udem.edu.mx/Esp/Estudiantes-Internacionales/PublishingImages/tramites_migratorios/visa%201.emf.jpg)