"Not gonna happen," my friend said. Both on the time and the money fronts — ESPECIALLY if your hair has been dyed before. It takes a LOT to lift hair that much, and you'll probably have to do multiple appointments that take multiple hours each — and that's if the stylist thinks your hair can withstand the process. If you're blonde going dark, it's a LOT easier, but still, don't expect something super quick. If you're going in for any color, chances are the whole process will take over an hour.