This will be different for everyone, however, as a general rule, at-home bleaching should not take more than 45 mins.
You will be disappointed if you assume that leaving the bleach on for an extra 15 mins would result in a brighter blonde.
If you leave it on your hair for too long, it can cause serious harm.
Oh! Tip: Lightning Kit
The At Home Hair Bleach Kit is the perfect prelightening canvas for Semi Permanent Hair Color. Infused with bond-protecting Plex 2.Oh!, enriched with Argan Oil, and featuring Comfort Fragrance Technology, it offers a worry-free bleaching experience, creating the perfect canvas for our semi-permanent hair colors allowing you to embrace a spectrum of your dreams without fear.