Awasome How Long Should Bleach Sit On Hair References. If you let it stay on any longer, you risk making your hair brittle or even causing it to break off. Web the general rule of thumb is to leave 20 vol bleach in for 30 minutes.
Then, rinse out the bleach. Each hair type is different and there is no cookie cutter amount of time to leave bleach on hair. Always follow the directions that come with the hair bleaching kit you’re using, as a general rule of thumb.
