Poorly done. This is one of the most obnoxious updates of macOS I've endured. It was put together in a thoroughly clunky, lazy, user-hostile way that is guaranteed to upset users. Specifically, beyond its 5 restarts, its final phase offers NO sign of activity other than allowing the user to move around their cursor. Otherwise, you'd think the thing had locked up. It just sits there for over half an hour looking dead. From my experience, it does indeed finish. It's not the time it takes to install the nearly 1.7 GB of data. It's the poor notification to the user that anything-at-all is happening. - - If you watch the update carefully, before the fifth and final phase you will very briefly see a rough guestimation of its finishing time. But once that notice abruptly disappears, users are left 100% in the dark for far too long. - - This CANNOT ever happen again Apple, you inconsiderate louts. Jobs would be ashamed. I'm certainly ashamed.