Verified answer

Im assuming your asking about the ones that you get glued/braided in.

They should last at least 3-4 months depending on where you got it done the kind of glue they used etc.

I would suggest using clip on extensions instead, its much healthier for your hair. the glue in ones do a lot of damage to your roots and really hurt it you accidentally yank them out.

braided in ones are just as bad- they can cause breakage at the roots and your hair can fall out!

Hope i helped =]