Nahh.. sounds like a mistake to me!
(joke!)
That's amazing! Congratulations!
So - there's a MASSIVE delay on printing in London. I actually used the webform to email them to say 'There's a DM but no details - can you tell me more about the status of my application?' and they wrote back direct via email in 24 hours to confirm. Try it - otherwise, the GCKey will not update until the COPR is actually put in the mail.
So great to hear this - you're on your way!
EDIT: To answer your original questions - 3-4 weeks was the delay in actually getting the COPR in the post. But they confirmed by email straight away - because at least you can start planning then!