If one has a site full of content and then decides to change hosting, domain and all, and then put all of the old content on the new site, will this be considered as doubled content by Google? How long after closing a site it takes that a site is removed from Google listing?
That is a good question. I have duplicate content at several pages - just want to remove it from the others and leave at one only. How much time would google "remember" the content?!
AFAIK, Google only "remembers" content if it is there. In other words, it's only a duplicate penalty if they both exist at the same time.