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Google, like many search engines tend to hold their DNS cache for some time, possibly several months. I have never had to move hosts but if I was going to I would prefer to do it mid month, i.e half way between the update, new crawl and the new indexing. Googlebot these days tends to start crawling as the new index goes live and then re-check just before the next update, so these times would appear to be most critical.
Any advice on how long I should keep both the old and the new site operational? Is a month long enough? Will Google view two sites (on the old webhost and the new webhost) with the same content negatively?
> Will Google view two sites (on the old webhost and the new webhost) with the same content negatively?
No, that isn't a problem. Google records the URLs; having a URL on two IPs won't matter.
> have gained so much
That's great Melanie, now you've started posting the addiction will hopefully set in:).
Ciml, just to clarify, are you saying a site/URL can have multiple hosts without the danger of being viewed as duplicate content ?
Could this then be used as a "belt and braces" method of ensuring a site is never down during you-know-who's crawl?