It all depends with who you are and if you wash and clean your hair system right also my stylist always tells me I can't use any type of shampoos keep that in mind if u want you system to last longer u must take care of it ... Love my system the price is great too
Im 8 months into my current hair system and I wear daily. Morever, I go to the gym 4 times a week every week and sweat like the proverbial pig so 8-months is good going and as you say care is so important
Regarding shampoo I use Nearly Natural: Argan Oil Shampoo. It is free from sulphate, paraben and sodium chloride. In addition, being gentle and precise in shampooing helps. I never blow dry it.