# How much Google takes to deindex pages after disallowed from robots?

By accident I have let Google index lots of junk pages. Now I have added them to disallow in robots.txt.

Will Google completely remove the pages after seeing the are disallowed from robots? Please note that I have far to many pages to manually remove these pages in Google's Webmaster Tools.

<meta name="robots" content="noindex" />

Sometimes Google indexes some URLs (but not the content) despite the Disallow in robots.txt. See my answer to this question for details.