You might want to try a strand test on a couple strands and see how long it will take for your hair. The timeline on the box is a guideline and it may take little more or a little less time depending on your hair type. I have fine hair and my hair takes no time to start breaking down. The middle and front part of my hair is more regular than fine, so I go by the timeline for normal hair and I relax the fine parts last which is the back and nape. I use a normal relaxer too. In all I go approximatly 15 to 18 minutes, but again that's for me. You want to test to see what's good for you.