Hi Pete,
I know you disagree, and that is why I said this is my experience in the Netherlands. I remember a very similar discussion last year. I'll let everyone make up their own mind. But I was told by the people from our jury that 1 second per photo (average 1,5 - which would mean 2400/h), with the right setup (i.e. pre-loaded images, or very fast connection, and simple-one-click-dismissal), is actually doable for most photos - because many are simply too boring or qualitatively bad and can be dismissed as 'top-50 material' from 10.000+ photos. Others even just scroll through heaps of photos. Also, please note I was talking about people who go through huge amounts of photos on a professional basis. Obviously not everyone can do this so fast.
Whether that is the kind of judging you like, is another question - but I think it is possible to go that quickly. But this also means you probably want multiple people looking at the photos. Because if you do it so quickly you're bound to make mistakes; having multiple people independently reviewing should reduce this quite a lot.
Again: every country will take their own approach and that is totally fine.
Best,
Lodewijk