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If a new post can be indexed and result in the SERPs within a few hours, why should it take months to understand that a 301 means "permanently moved".
Your old site's server should be configured to serve 301 permanent redirects to your new site.
Ask webmasters to update their links to your new domain, and make sure incoming links to your old site are redirected correctly using 301 redirects.
For other general questions refer to our guidelines for moving your site to a new domain.
Duration of effect
Your change of address notification remains in effect for 180 days, by which time Google's index will be fully updated with your new site's information. After 180 days, you can extend the period by submitting the change of address again.
why should it take months to understand that a 301 means "permanently moved".