When can I bleach again?

Hi,

I have just bleached my hairline, which is naturally brown, I'm almost exclusively grey to white over all parts of my head other than my hairline. I'm very please with the result of the bleaching, as my hairline looks so much more natural now!

I just used a bleaching kit and followed instructions. Although I'm so pleased with the bleaching there is still a little pigmented hair in th hairline that I would like to banish. When could I re- bleach again please, as I don't want to damage my hair?

The reason for my natural brown hairline was a hair transplant many years ago. I guess the surgeon took pigmented doner hair from the back of my head and used it to form my new hairline.