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There has been several debates on the topic of the geo location of hosting provider and the impact on SEO and rankings. As a best practice, it is recommended to host in the same country you are targeting but are there any studies available that confirms the web hosting providers location influences rankings?

On average, how long does it takes to recover 80% of the rankings if two high authority domains are combined without chaging any content? I totally understand that each domain is different and search engines can treat them differently but if all the steps are followed to the T what are the chances?