I install new versions of Xcode about every two weeks on average. The amount of time it takes to have a new Xcode running is at least an hour: first you download a massive XIP, then the system "verifies" it forever when you try to open it, then it takes forever to unarchive because it's huge, then you need to copy it from ~/Downloads to /Applications which takes another couple of minutes. Then you hit the component installation part… (I think this step has something to do with installing new MobileDevice frameworks?)