This article is from the eBay FAQ, by William B. Shaw email@example.com with numerous contributions by others.
Even if a seller ships your order on the day they receive the payment, there
is still an interval of time before your item arrives at your doorstep.
Factors that affect shipping time include distance, class of service,
unexpected mail delays, misaddressed mail, and quality of packaging. Normal
delivery times can range anywhere from one day to eight weeks. If you've
done your homework, you should know the seller's track record for shipping
by reviewing his or her feedback. If you feel your package is late, contact
the seller to find out what is going on. Whenever possible, obtain a
tracking number so you can check the status for yourself online. If you need
to contact the seller, you should verify the shipping address, date sent,
and the tracking number.