It's So Confusing!

So I ordered an Adrian Belew cd from Amazon.com's Marketplace, and I got a confirmation letter back from the seller, and it said:

The CD was shipped yesterday 09/20/02 per USPS Media Mail to below address and should arrive within 4 business days according to the post office's estimated delivery schedule.

Now this puts me into a slight quandary.

Firstly, 9/20, a Friday, is a business day. Does this count as one of the 4 business days? If so, I should get the CD today. If not, I should get it tomorrow.

However, in the eyes of the USPS, does Saturday count as a business day? I wonder this, as the USPS does do business on Saturday, but the majority of the business world is a Monday-Friday sort of thing.



If the USPS doesn't count Saturday, and Friday isn't included, than I should be getting it tomorrow. But then this is Chicago, so I'll probably get it next week. ;)