With modern oils and materials most modern shim and bucket bikes don't seem to need a lot of adjustment.
There is no need to strip to check , a pro mechanic will have a "stethoscope" and will be able to tell in a few seconds if they are ticking nicely.
My VFR didn't need any adjustment in 120,000 km , others report similar. So a lot will never have them done!
Then a dealer will usually have a lever / whatever which will let them depress the valve head and get the bucket off without removing the camshaft.
But he still might have 16 to do, and sometimes a fair bit teardown in the body etc, so 4 or 5 hrs is not unknown.
Just did the Hima for the first time since the 500 km service, exhaust was 7 and inlet a tight 2 at 36,000 km , so if you need to do it every 5000 km buy a better oil and keep the revs down!