Google says 301 redirects should be kept in place for at least a year to ensure the changes are recognized permanently.
Google answers how long 301 redirects should be kept in place after a site move, saying year is the minimum recommended length of time.
Why a year?
Because it takes a while for Google to process a major change like a site move.
If redirects are in place for less than a year then Google may not end up crawling the links enough times to recognize the site has been moved permanently.
This topic is highlighted in the latest installment of the Ask Googlebot video series on YouTube.
Original Score:- https://www.searchenginejournal.com/google-keep-301-redirects-in-place-for-a-year/428998/
