How Long Should a Windows Update Take?
Most updates finish in 10-30 minutes, but major feature updates can take 30-60 minutes or longer, particularly on a mechanical hard drive rather than an SSD. As long as there's still activity (light activity, screen changes, drive noise), it's usually still working rather than stuck.
What's normal
Regular monthly updates are usually quick. Major version updates (like a new Windows feature release) take considerably longer and can reasonably run for an hour or more, especially on older hardware.
When it's actually stuck
If there's been genuinely no change — no light activity, no percentage movement, no drive noise — for well over an hour, it's reasonable to suspect it's actually stuck rather than just slow.