my sister could tell you best but i'll tell you what i know. i know she got the whole kit. i think she caught a deal and got it for like $100. when she put it in she followed the process, and i forget the order and names of the productrs for each step but any ways she did each step by applying and adding heat and washing ect. then she applied the products for styling/blow drying and stuff and when she flat ironed my hair it looked like i had a fresh relaxer.
i think the first and second application i felt like it wore off quick but that might have only been because my ends were relaxed so compared to my ends my roots were unbearably thick but now its been a while atleast 2 months since my last application and since there is so much new growth its a whole lot better. i havent felt the need to do another application because i've been protective styling and i have almost as much natural hair as relaxed hair. the relaxed ends are usually hidden in my bun.
maybe i'll ask her to give me another "touch up" and take pics of before and afters so you can see that my natural hair is that 4z as everyone likes to say super kinky hair and how it can got to straight so easily.
hope i answered your question lol