Awwwww!! Thanks Cutenss! for everything.
My first BKT, I did wait the four full days. Since it was my firt time doing it, I wanted to "go by the book". But my second time, I had to go somewhere to go, and I knew that I would not flatiron anymore, until my next treatment. So I used a wave iron the second day, and then washed later that day. When I do it on Friday, I will probably wait the four days just because it is my birthday weekend. Otherwise no.
Mystic, I AM SO HAPPY that everything turned out the way you wanted. Your hair looks AWESOME! Gotta love some wash n go's BKT style. Hair is trial and error. But always know that you have us/this forum to guide you.