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How long do i have to leave the bleach kit stuffs in my hair ?

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I have this uh bleach kit thing that i bough from Sally's Beauty Supplies, i've used it before, the parts of hair that i tried bleaching didn't exactly go to the color i wanted. I don't remember how long i left it in. But i have some in the area of hair that i want to be like, bright blonde now, but i'm not sure how long to leave it in. My hair is already dyed jet black, yesterday. Any answers ? Thankks.