I just took mine out after 4 months. I learned how to redo them from Youtube. If you put product in your hair as you were doing your braids, then I would not keep them over 2 months. During on redo, I put green tea butter on some of them and I had to fight to get the gunk out.
Like Nonie said, redo the ones around the hairline at least once every 3 weeks or you will have dreds when you take them out.