I have gotten long times out of hair units typically. I wear a hat a lot so that helps. I wear a short style with hair product and I dye the hair when its needed. I have gotten as much as 3 years out of one system lol. I know crazy right. But sometimes systems shed like crazy. One system I only got like 5 months out of. I still can wear it but it lost so much density I got a hair add, and it still lost a crap load after.