not necessarily. You must not leave in bleach for more than 60 minutes, this is dependent on the volume as well. The stronger the volume, the quicker the results, the less you'll want to leave it in. It might stop working after 60 minutes, but it can still cause damage to leave it in. It's chemicals after all. If the OP has orange and yellow hair, then a green or white toner will counteract it. Pale yellow hair can turn platinum with white toner, and orange/red hair can be neutralized with green toner. The salon should fix the OP's hair for free, any decent hairdresser would do the same. I bleach my hair all the time at home with 30 and 40 volume developer. It doesn't do that much damage if you condition and use protein treatments, and if you give your hair a break once in a while. My hair has yet to fall out, turn gummy, or be cut off because I take my time and do it right.

musikbox: You don't use green toner. I have white blonde hair. After bleach the toner you should use is dependent on whether your hair appears yellow or orange. Orange=blue and yellow= White with a hint of purple or purple. The conditioner or shampoo you use to retain the shade of bleached blonde should also be blue or purple. It follows the colour wheel, purple is opposite of yellow, blue the opposite of orange. Even when painting a self portrait involving my platinum hair I used yellow paint neutralized with purple.

yeah, I know, I meant blue, but I was in a rush to type this >____<

lol