How long does it take to remove pages from Google’s cache?

I added the meta tags to do so, as described in this post about eliminating your pages from Google’s cache, and am starting to see results already, less than 5 days later.

As Google re-indexes the pages, it drops the Cached copy. This doesn’t affect the current snippet at all. So basically it’s just a matter of time until all or your pages are dropped from the cache. The time will primarily relate to the amount of incoming backlinks your website has, and the amount of your PR. Give it a month or so on an unpopular website.

I haven’t seen any changes in the rankings of the pages I’ve eliminated from the cache. I’ll keep my eye on it and report back with any details I have.