Cool How Long Does Overtone Hair Dye Last Ideas. Overtone generally lasts about 20 to 22 washes, according to the manufacturer and various laboratory tests. But how long overtone lasts in your hair will depend on individual factors like porosity, texture, health.

Web it’s best to let overtone hair color sit on your hair for around 15 minutes. But how long overtone lasts in your hair will depend on individual factors like porosity, texture, health. How do you get it to stick around longer?