I decided to remove a small section of my site that had continually updating affiliate offers along the lines of "today's top 10 widgets". The links all redirected via 301 through a single redirect page that was blocked in robots.txt, the standard installation for this particular program. Additionally all links pointing to the redirect page carried a nofollow tag.
After removing the offers from the handful of pages they were on my GWT has become inundated with 404 errors, to the tune of 30,000, most of which expired some time ago, years even.
Google never forgets a link, is there anything I can do besides just leave the 404 errors in place to speed their removal from GWT? Marking them fixed just gets them tagged as 404 again and they return.
How long does it take for 30,000 404 errors to stop being reported these days?