Sierra installer hangs on 3-4 minutes remaining

Hello, everyone. So I’m installing Sierra in VirtualBox via this tutorial: https://youtu.be/9lXlKQAj4m8

I’ve tried restarting twice, but whenever it gets close to finishing, it fluctuates back and forth between “About 3 minutes remaining” and “About 4 minutes remaining.

Is this a normal thing for the Sierra installer to do? If so, how long does it usually do this for before continuing to install? Any info is greatly appreciated.