Cool How Long Should You Wait Between Hair Bleaching References. Leaving bleach on your strands for more than the recommended time can lead to damaged hair. Wait for at least 48 to 72 hours before shampooing or hair conditioning after bleaching it.

As such, this is why the experts always tell us never to bleach too often. Web the maximum amount of time you should leave bleach on your hair is 30 minutes. Like we discussed, how long you need to.