My period lasts for more than a month

First of all, how old are you? It could mean the beginning of menopause.
If that is not it, it could be something serious. I suggest you consult your Ob. It could be something like polyps, you may have a cyst. It's not normal for someone to have their period that long. But there is a shot that the dr. can give you to stop it if there is nothing else going on.