About 1 Hour
The restart was initiated by Norton power Eraser - I did not realise there were any updates waiting.
But as 18 have been successfully processed is there any reason why the others should not be?
It does want to turn off! It comes back with update message.
It has now said it installing update 20! Do I just let it continue?
Restarted and NPE is running. Not sure and obviously cannot prove whether your solution worked or co-incidentally it had nearly finished the update.
It is not too unusual for updates to take an eternity: the NPE could just have been a red herring. It completed OK.
All OK now.