Google Webmaster Trends Analyst Gary Illyes addressed a persistent question: How long do 301 redirects last? His answer: one year. But like many things with Google, there’s a bit more to it. Illyes goes on to explain that even after the redirect is removed, the signals do not go back to the origin page but stick with the destination page. So the answer to, “How long do 301s need to be alive to permanently move a page in Google’s eyes?” The answer is one year.
Let’s back up and explain that in detail.