I'm a hairstylist, hair grows about 1/2 an inch per month. Theres not much you can do to make it grow faster. Check out Biotin, take 10,000 mcg. Skin, hair, and nails vitamins can help too. What these products do is encourages growth but also promotes healthy hair (and skin and nails).
No elastic bands in your hair, dont use a lot of heat if you can help it, don't rip through your hair with a brush, eat well, get your sleep, take your vitamins, and wait. I've grown my hair for three years and it's below my breasts. It'll get there with some patience and determination.
Good luck!
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