The USPS will not estimate such delivery time; they state that delivery times "Vary" for First Class Mail.
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Shipped (at USPS Post Office) -- December 10, 2012 Delivered -- December 20, 2012 In total, 10 days which is two to three times longer than it should have been. (USPS says delivery is in 3-5 days.)
"Prefix CW" in a USPS tracking number indicates that the package was shipped using a USPS service called "USPS Priority Mail Express International." This service provides fast international delivery with tracking and insurance included.
The USPS does not mail from China, they have their own postal service. kurtdriverUSPS does ship via International Express USPS both from and to China; Priority Mail as well. I just verified this via their website. Delivery times are guaranteed within a timeframe and tracking is standard on Express.
The USPS does not guarantee delivery times, so it takes however long it takes. Typically it's 2-4 days not counting Sundays.
The normal USPS delivery time for a letter to travel from Alabama to Michigan is between two and three days. The average price to mail a small letter in 2013 is under $2.
There are set times for mailbox pickup only.
By getting a tracking number. USPS calls it delivery conformation.
International lettermail from the US to Canada is $0.80 through USPS.
Regular first class international postage from USPS is $0.98.