Our experience has always been that once the Cunard agent has completed the transfer the confirmation arrives very quickly, and most times before I have even completed the phone call. Hearing of long delays is, for us, an unheard of situation and often I can open the confirmation pdf file and check the details whilst I am still talking to the Cunard agent. There may have been a technical problem very recently, but hopefully if so it will be sorted out quickly. Even when booking whilst on board at Future cruises, the confirmation mail arrives before we have left the office.