What Causes Long Period After Coming Off Depo?

hey, i got off of depo after being on it for 5 years. I got my last dose on aug 2010. the nect one was due nov, 2010. My period finally started on may 7 and went off may 10. Then i got dmy second period june 11th and it just went off june 23rd. Is it normal for my period to be on that long? I need to know when i would ouvalate this month