I was planning on getting an ash brown balayage, I started the bleaching process on Friday and the stylist said it'll take a few more sessions till I can get the "ash brown" I want. I then realized I won't have the money to take care of it and now I really want to go back to my dark dark brown hair. Right now it looks disgusting, an ugly copper color. How long should I wait to put a dark brown dye into my hair?