How much and how fast does using Lemon to lighten your hair work?

No, it does NOT lighten your hair. I think so many people get confused and think that it will actually dye your hair but it doesn't. It just brings out the natural highlights from your hair. And you have to be in the sun like ALL day. I have dark brown hair and I dyed the underneath with koolaid. It works. You don't need to lighten it first. But beware! Koolaid stains your hair! It's not going to wash out after a month like it says! Mines been in since like may and it's still as red as it was!!! I like it but almost regret it.. Lol. Hope this helped! :)