Questions
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How long will Google take to stop crawling an old URL once it has been 301 redirected
I agree with Ryan. As long as the old URLs are out there in the web, Google will follow them. At the same time, redirected URL list will be very lengthy if you are maintaining a big site and maintaining them will consume your resources. Check link value of the old URLs as a first step. If they have no value then you will be fine to retire such old URLs.
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