My mum was shifted to yet another hospital for more rehab, this one's within 20 km of her home. They have a reasonably extensive website but do you think they bother to mention little details like visiting hours?

Nope.

This is important as my siblings (except one brother) have at least 50 minutes further to travel for visiting. It's not much different for me, the latest hospital is 50 km away vs 31 but probably only 5 minutes further timewise. that's the difference between semi-perpetually roadwork-affected "freeway"/suburban speed limits & freeway/country arterial road limits.