I'm sure there's no specific rule, but did anyone observed how long does it take to Google to stop reporting backlinks after they have been removed?
If such backlinks are in connection with i.e. Penguin penalty, should I assume that, as long as links are being shown in WMT and as a result of "link" query, Google is considering them as live and therefore keeps counting them in a negative way?
For example, it's been more than three weeks since a specific link has been removed, yet Google keeps showing it in WMT and as a result of "link" query.
I checked the website in question with some cloak-revealing tools which showed nothing (no cloaking to Google). Now I wonder if it's some cache issue, or Google is simply slow on this.
I mean, it certainly crawls that website on daily bases and should know by now that link has been gone.