The voice msg says average call times are 30 mins.
I don't actually mind that; I can leave it on hold (quietly so the music doesn't tip me over the edge), but to join the queue you have to go through the 'what are you calling for' bot, which has about 7 layers, and listen to them telling me that I might be able to find my answer online.
I need my class 3 NI number FWIW, and everything I've looked at points me to having to call to get it.