This product is fantastic. It works just as good as the salon for a lot less money. My hair is 3 " past shoulders & this kit covers 2 uses myself & my friend usually use 1 kit between us. As long as you use sulphate/sodium free shampoo / conditioner it will last up to 3 months we usually re- do every 10 weeks & it takes about 3 hours. It makes blow drying a lot easier & I don't need to use my straighteners as often.