Duration of System Update - Nexus 4 (after download) - 4.4.2 to 4.4.3? How long is it supposed to take to install the system update, I think from 4.4.2 to 4.4.3, on a Nexus 4?

I downloaded the 70 MB and after the phone restarted, it attempted to install the system update for the last 2+ hours. The progress bar starts, goes all the way to the end, the screen goes black for a split second and then the install screen appears again with the bar starting at the beginning again. The phone is not brand new anymore, but I would expect it to go faster.

If this is too long and maybe an error occurred, can I cancel the update process by pressing >Vol-Down + Power Button&lt; without having to worry about an unusable phone afterwards?
I had the same issue, after giving up on waiting more, I restarting the phone.

After reboot, the update started from where it was, and finished as originally intended.

To restart the phone, hold Vol-Down + Power for a few seconds.

Posting answer as the OP only posted solution in a comment.