Mac OSX “El Capitan” software update stuck on “11 minutes remaining”

When installing a software update for Mac OSX “El Capitan” that required a system reboot to install, it seemed stuck on the white screen displaying a text “Installing software update: About 11 minutes”.

Mac OSX installing software update

The solution was quite simple – just wait. It seems the time calculation is really off. After about an hour it stepped down to 10 minutes, so it’s not stuck. It just takes a lot longer than the system calculates.