I just got out of school and I want to take this time in the summer to grow out my hair. I usually straighten or curl it every other day and use little amounts of product. Yet my hair grows pretty quickly. This summer I decided not to use any heat on my hair, no products, and I found a great shampoo and conditioner for dry and damaged hair. What else could I do to stimulate hair growth if possible? And how long will it take for my hair to grow 4 inches if I do those things?