I have just been round my small setup and run an OS update, took about an hour. That includes a reboot of a dedicated server with OVH.
a pi and mini PC at home, a dedi at OVH running 2 LXC and 5 qemu vms. All deb a mix of 11 and 12.
I spend Wednesday evenings checking what updates need installing, I get an email every week from newreleases.io with software updates and run Semaphore to check on OS updates.