I'd expect contact within 3-5 days and usually get it. Nowadays I tend to request it on the listing too. Sometimes people email in advance to say they will be away when the auction ends and is it ok to bid. I've only once had a non-collect and she, oddly, paid for the item but then never came to pick it up!
You can start the
unpaid item process after only 4 days but it may be worth requesting their details and ringing them first. Given that it's the school holidays I might be inclined to wait 7 days before opening an unpaid item case. I once had a really slow payer and then he complained about the speed of postage the day after he paid - charmer