how long do hair extensions last 

each individual varies depending on the condition of the person’s natural hair. If your hair is very fine then you should only wear your install for 1-1&1/2 months. The tension from combing, washing, and the weight of your extensions can become to heavy for your new growth and cause it to break off. Also all sew ins should be properly maintained by tying your hair up at night and sleeping on a satin pillowcase to prevent tangling and breakage, thanks