One to two weeks? Given that Amazon's delivery estimates are optimistic at best, I'd be a little put off from ordering this from them. I pre-ordered the previous biscuits album from them, and got it over a month after it appeared in high street record chain stores.
They aren't great at supplying things which aren't supplied by the truckload. If you aren't buying a Robbie Williams album, best look elsewhere. Even popular independant music gets very poor treatment here.