"Rebooting doesn't really take that long on a PC with an SSD"
It's not the rebooting that takes time, it's the "Configuring updates for your Computer" stuff. It'll sit there on shutdown and/or startup like this for... who knows how long. There's no way to know if it's making progress, so you're left trying to guess if the update process has hung. (And this is a far too common occurrence)
Actually does anyone know what is happening when it "configures the update"? The original microsoft post suggests windows update currently simply replaces assemblies. That should take milliseconds on a modern PC.
It's not the rebooting that takes time, it's the "Configuring updates for your Computer" stuff. It'll sit there on shutdown and/or startup like this for... who knows how long. There's no way to know if it's making progress, so you're left trying to guess if the update process has hung. (And this is a far too common occurrence)