Yikes
Thankfully I run either XFS or EXT3 (if I dual-boot on Windows) on my machines.
That said, patching shouldn't take long.
(Versus the last batch of patches Microsoft pushed out, my work laptop started patching Friday morning and was still telling me it was applying the updates and not to turn off my computer on Monday evening. If I hadn't hard-power-cycled the laptop, it'd still be patching a week later!)