I think it will take the same length of time however you do it. If you install without the internet connected the initial installation will be short but then you have to download all the updates afterwards and activate it afterwards. If you have the internet connected when you install you will be prompted to download the updates and activate on completion. There is a small risk when installing while connected in that the anti-virus will not be installed and no fire wall working, but this is a very small risk. For a simple procedure Click Here
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