How long will Google Webmaster Tools try to crawl old links? We are seeing errors in the crawler that show linked from URLs that haven't existed in months. Will it just keep trying to crawl the link until we provide a redirect?Also, we're seeing 404s that say the linked from source is our homepage, and we have not had those links on the homepage in quite a while.
Google Webmaster Tools linked from lists dead links
google search console;web crawlers
There's no set time frame for when Google will stop. But they will eventually stop. They need to keep crawling them for a period of time because those pages may only be unavailable temporarily due to an error on your end. So they want to give them a chance to reappear in those cases.It is assumed if those pages were intentionally removed you would serve up a 301 redirect to the new URL or a 410 GONE for deleted pages. So in your case you should consider sending 410 GONE statuses for those pages to speed up the process.