How Long Do You Leave Hair Dye In. The light color is preferable for all. In the case of mid-level color you should keep the dye in for 20 minutes.
Hair dye should be left in your hair for approximately 30 to 45 minutes. I often leave dyes on overnight because it means I can put it on just before bed and I dont actually have to wait 4 hours Ive slept through it. If what youre looking to do is just cover up your roots to even out your color you should leave the dye in about 45 minutes.
Dye your hair at home to avoid expensive salon.
If what youre looking to do is just cover up your roots to even out your color you should leave the dye in about 45 minutes. And now what youre all probably dying to know or should I say dyeing in this case what if you leave permanent blond hair dye on your hair for too long. Without wanting to or researching it I left the dye in my hair for almost three hours longer than the instructions recommended on the box. Temporary hair color is a great way to try out different colors before settling on one you really like.