How long should it take to receive feedback from the seller?

[leo4x40]

I have left positive feedback for the seller and am waiting to receive feedback even after emailing the seller. How long should it take to receive feedback from a seller?

[heidilynn0_3]

http://community.ebay.ca/question/Selling-On-Ebay/Why-Doesnt-Ebay/3000006552?#msg4000040907

[femmefan1946]

Feedback is entirely voluntary and your seller may not ever leave it.

Not a very polite thing to do when a paying customer was nice enough to leave it first, but there you go.