I sent an email to RTL expressing disappointment that their LW 234 kHz transmitter was now closing overnight (so I was missing some of Georges Lang’s programmes).
In reply, their audience relations apologised for the inconvenience and said:
“En effet la diffusion des Grandes Ondes est temporairement suspendue entre 01h et 5h.”
 translated: “Indeed, the broadcast of the Long Waves is temporarily suspended between 01 a.m. and 5 a.m.”

Checking last night, 234 kHz does now go off air at 0100 French time (midnight in the UK) so it stays on air 1 hour longer than a week or so ago.
So it now is currently off air for just 4 hours it seems (not 5): 01-05 CEST (= 0000-0400 BST or 2300-0300 UTC).

Alan Pennington, Caversham, UK to Longwaveradiolistening iog (2022-03-27)