Slightly off-topic, but are you aware that eBay makes up their own delivery "estimates" which, in reality, have no bearing on the speed that various postal companies will deliver items.

The only thing a seller has control over is how fast they get the item to the post office, after that it's beyond their control completely. 

I say this because your feedback left for others brings up ETA's for delivery a lot, I do hope you're not marking seller's DSRs down because the delivery time doesn't match eBay's "estimates".