Nils Rostedt schrieb:

enough for safety. In contrast, up here ATC gives the landing clearance only
when the previous plane has actually vacated the runway.

I don't know the exact regulation, but I remember having once received
the clearance to land when I was number 4 and had not even reached the
downwind yet. This was in Germany, and I was pretty surprized. I suspect
they moniored me and would have withdrawn the clearance if needed.