For all Windows 10 users – there is a large update arriving at your PC soon (if it hasn’t already arrived).
The download alone takes 45+ minutes and the installation/update at least the same amount of time – longer depending on your machine – and includes several restarts.
So when you get warned about an update pending choose a time when you can be without your PC for an hour or so.
Don’t be put off by the amount of time involved and remember that all system updates are likely to include security elements so don’t avoid it. Do the update as soon as is possible.