In theory, as long as you are leaving your old host on good terms & youhave everything uploaded to the new host when you make the DNS changes, you should experience no downtime at all.
If you do have downtime & we get "no dns" error message, your sites will be removed, but not blacklisted.
If you don't have everything uploaded to the new server & we get 404's, you will be blacklisted.
There's way too many variables - LOL
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