How long should you leave bleach on brown hair? Between 20 and 30 minutes

brown haired woman wants to know times

  • If your hair is dark brown, you should leave the bleach on for a maximum of 30 minutes.
  • If your hair is brown, you should leave it for a maximum of 25 minutes.
  • If your hair is light brown, you should leave the bleach on for a maximum of 20 minutes.


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 Are you thinking of bleaching your brown hair and you want to know how long you should let the bleach work? 


Well, now you know. Bleach on brown hair should be left on for 20 to 30 minutes.

What changes whether you should leave it on for 20 or 30 minutes?


Basically two things:

  •  It depends on the hair color you start from.  For example, if your hair is light brown, you should leave bleach in for less time than if your hair is dark brown. Because darker pigments are always more resistant and you will need more time to remove them.
  •  It will depend on the condition of your hair.  Because virgin hair, for example, is more prone to fade than colored hair.


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Also, beyond my recommendations about how long you should leave bleach in your brown hair, you should keep in mind something extremely important.

 As you leave the bleach in your hair, you should continuously monitor your hair.  That thing where you apply the bleach and then sit comfortably on the couch having fun with Tik Tok videos, you can forget it.

Because the chemical reaction that the bleach produces in your hair progresses minute by minute. And if you’re not careful, you can burn your hair.


When we’re talking about chemical processes in hair, respecting the exposure times is essential. You can’t expect dark brown hair to turn blonde in one bleaching session, for example.


That’s impossible unless you put your hair in the hands of a professional, who will inevitably use a product like Olaplex to lighten your dark hair to a blonde in a single session.

Many women believe that if they leave the bleaching mixture on longer their hair will go blonde faster. But all they do is ruin their hair.

And since I don’t want you to ruin your hair, read on.


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Leave bleach to act on brown hair for 20 to 30 minutes

bleach brown hair

And this time will depend on the color you start off with, that is, how dark your hair is.


On dark brown hair, leave bleach to act for up to 30 minutes

Why? Since your pigments are more intense and persistent, the bleach needs more time to remove them. And  you should never leave it on for more than 30 minutes. 

After 30 minutes, if you haven’t reached the color you wanted, you should rinse the bleach immediately with cold water anyway. You can then bleach your hair again after three weeks.

In addition, it’s essential you cover your hair with a shower cap during the process to keep in the heat of the chemical reaction and to ensure it progresses evenly.


On brown hair, leave bleach on for up to 25 minutes

Brown hair has weaker pigments than dark brown hair, so you should leave the bleach on for less time.

In this case, I want to give you another option to maintain the temperature of the bleach.

  • Put on your gloves and apply the bleach mixture to your hair.
  • When you finish distributing the bleach, comb and massage your hair for 10 minutes.
  • Once the exposure time has elapsed, up to 25 minutes, rinse with cold water.


On light brown hair, leave bleach on for up to 20 minutes

Light brown hair occupies the middle position in the hair color chart. That’s why many of my colleagues consider it a brownish blonde. And obviously, its pigments are much less resistant than those of brown hair.

Monitor carefully how the process is going because if your hair is naturally light brown, chances are that after ten minutes the brown will have disappeared from your hair.



Have you ever heard the phrase “dress me slowly, I’m in a hurry”? This phrase belongs to Napoleon Bonaparte, and it seems to me that it fits perfectly to this topic of how long you should leave bleach in brown hair.

Because if you want things to go right, it’s best not to rush. And that means you shouldn’t leave the bleach on longer than the recommended time.

Which for brown hair will always be between 20 and 30 minutes.

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