I ordered an iBook for my father last Monday. Arrived this Monday, so precisely seven days. We had stock except for the 60GB harddrive.
I ordered a 12" PowerBook through my university with extra RAM and larger harddrive and it arrived to them in three days. Granted, they are located right beside a huge Fedex facility.
Last summer, a friend of mine ordered a 12" iBook with larger harddrive (he lives in Boston) and it made it to him in 48 hours from the time of his order. China to Boston in 48 hours is impressive for any shipping service.
All depends on where you live and whether or not your order is processed before the close of the business day. A few other factors as well.