Hair extensions last a few weeks to years. It depends on what kind of hair extensions you have. If you buy cheap hair extensions they might last one month. If you buy good hair extensions and take care of them, they might last a year or two. You have to have them taken out and your own hair re-braided every couple of months. This keeps your scalp and hair healthy, and the hair extensions will keep longer. Do your homework before you buy any hair extensions or have anyone put hair extensions on your head. http://www.hairboutique.com/tips/tip034.htm
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I have hair extensions and they have lasted me for a couple years. Mine are real hair extensions though, and they're not sewn in. I would suggest clip in hair extension that are human hair, the ones that arent real usually don't last long. You can also get synthetic hair extensions if you are bothered by wearing someone elses hair on your head; however; if you get them you can't apply heat like straighteners to them.