I was just wondering, after you use a box hair dye how long does it stay in your hair? Like how long until it’s completely gone? I dyed my hair over a year ago with a box dye. I know, dumb mistake. But I’m going to be getting my hair done at a salon soon, I’d like to go lighter but I’m not sure if that’s an option since I dyed my hair dark brown before. Since it was over a year ago would that make a difference?