In the beginning of ProxB.Com the proxies listed in categories were DOFOLLOW, I made them nofollow, but if I type: siteroxb.com the pages are still available in the search engine

How long does it take till Google removes them? Or won't they get removed as long as they 'exist'? They have been nofollowed for a few weeks now so...

Hopefully someone can help me, and I hope I posted it in the approriate category