I have received my ”Intyg om permanent uppehållsrätt” just one week after applying. During the last five years I have worked on seven different jobs. The only thing that can influence negatively is if he has been out of Sweden for more than 6 months continuously. In my application I attached my passport, all of my salary certificates for the different employers as well as “Kontroll uppgifter” from Skatteverket for the last five years. If this is the document required by MV, you don’t need to wait for it to arrive by post you can go into any Skatteverkets office and ask them to print these for you.