To avoid damaging your own hair and shortening the life of your extensions, it's important to take proper care of them. On average, with good care given, extensions can last six to eight weeks for sew ins, glue ins four to eight weeks, protein bonded six to eight weeks and clip ins, three to six months or longer. Just like your real hair, extensions require lots of love and care. It is possible for the extensions to get split ends and may eventually look damaged after repeated styling. To avoid this and protect your investment, go lightly on the heat styling.