Sold rug on ebay- how long should I wait for contact?

[shadowboy]

Sold my Yearlings rug on ebay- sale finished 8pm on Sunday 21st June. I've had no contact from buyer yet- I know its only tuesday but I want to know IF they at least plan to continue with the purchase. How long before I ask them/send a reminder?

When I buy on ebay I pay as soon as I get the email as I consider it to be a sale like in a shop.

 

[the watcher]

I have a note on my ebay sales to the effect that I expect contact at least within 48 hours of the sale finish. If they haven't contacted me by then I send an invoice via ebay, 3 days leter I follow up with a message via ebay.
I have only had one non payer in many years of using the site, and he simply forgot that he had bid on something and didn't expect to win it - by the time he got in touch I had been through the whole non paying bidder process, and relisted and sold the item