length is really not a factor, its more of how thick your hair is. if it is your length and really thick, your stylist will more than likely have to use more than one perm solution. also, the type of perm you get. if its straight back, which i wouldnt recommend for someone with long hair, its cheaper, and uses less rods. something like a spiral will use more, thus more work for your stylist. she will charge for both perms, and labor. long, thick, spiral perms will run sometimes up to over 100 dollars. might i suggest finding a beauty college? they are much cheaper and you can make a senior request. get someone thats about to be out anyway. same results, a lot less money. hope this helps.