I wore a sew in for 2 - 2.5 years. When I first got it in my hair was neck length in the front and shoulder length in the back. I would keep them in for 3 months at a time. Sometimes longer (my hair was like dred locks when I took that one out). I went to my hair dresser to get another weave put in and he was like I didn't need one since my hair was down to my bra strap. At the time I wasn't doing sew ins as a protective style, I was doing it for length. When I was getting sew ins I wasn't taking care of the hair underneath and was washing like every 2 weeks. Needless to say, i thought I was too cute with that bra strap hair and low and behold, it fell out for a number of reasons: My hairdresser was MIA, I didn't moisturize properly and used entirely too much heat. I'm in a sew in now and will keep this in for 3 months and get another one after I take this out. I'm a strong advocate for weaves because it gives your hair the rest it needs and is a super cute protective style (I'm so tired of bunning). Now I know how to take care of my hair underneath and I'm crossing my fingers for some major progress in the next six months.