One more example of this.
I had two one hour recordings - one from 6 May and the other from 8 May - that both finished processing today, after five and three days respectively. I also did three test recordings yesterday, of a minute or so each. First one processed in about half an hour, other two still waiting.
So it seems they do eventually get done, but there’s no pattern to how quickly based on length of recording or anything.
I also raised a ticket with tech support on 8 May and only got an auto-email acknowledgement.