The instructions for Phyto Index 1 says to start a timer as soon as the relaxer first touches your head.(It says application should take 5 to 7 minutes.) The relaxer shouldn't stay on longer than 20 minutes. Here's my question: Should the timer begin as soon as I start, or after I apply the relaxer to my entire head? I'm asking because it doesn't make since to me. It takes me quite a while to apply it (I'm a beginner and I'm trying to be careful. I was still on my second section of hair at 10 minutes!).If I wash it out at 20 minutes, the relaxer hasn't had time to "take" on some parts of my hair. Help me please...