SEO Tip #137: When I Change Domains How Long Should I Leave the Redirects In Place?
Matt Cutts: This is something where search engines can change their policies over time because we might see the web evolving or we might see how webmasters have issues or those sorts of things. I can tell you about my experience from moving MattCutts.com to Dullest.com and then Dullest.com back to MattCutts.com.
Whenever I decided to move back I used a 301 redirect and it took a period of several weeks
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