my current system I've been wearing for about 3 months and have less than 5% shedding. My first system lasted about 5-6 months, 2nd system went almost 9 months. The one I'm wearing now may be the best yet, Ive hardly lost any hair. I'm not sure why there is so many mixed results here but I agree with the poster to expect 3-4 months from what I read here.