I am sorry, but that is no BS, just pure facts. Granted the PC is not very powerful (CPU: AMD E-350), but the story is true. When the update started, I thought 'Shit that thing didn't just reboot itself. Okay here we are, that will take one hour max.'. But in fact, it took about 4 hours.

I have a Thinkpad x140e. It's unusable with Windows 10, but reasonably good enough with Ubuntu MATE.

I don't doubt you at all. This laptop took up took so long to boot with Windows that I'd take the time to make coffee.

Good luck installing these build upgrades in 10 minutes! For normal people they take between 30 minutes and 2 hours.