I can't recall what it was exactly, but I had ordered something that said that one time from amazon.com and they kept on sending me emails asking me to approve to extend the shipping time because they hadn't gotten the product in yet. It was kind of expensive so I didn't mind...actually I was counting them on charging me for it a little later. I eventually got it but it was a bit more than 4-6 weeks.
I recently ordered another book from them that's a hardcover collection and a bit expensive knowing I will have money for it in July when it's supposed to ship. I hope it doesn't ship in 2 days!
I usually avoid 4-6 week shipping for that reason and look elsewhere if it's something I really want. I guess I never chanced it enough times to find anything that ships in 2 days instead.