I recently made a purchase from someone who is generally known to be a trusted seller of fountain pens here (I prefer to leave this anonymous because I do not want to tarnish anyone's reputation unless there has in fact been a problem). We communicated back and forth via e-mail over about a week and I finally decided to make the purchase. The pen was removed from the site, a Paypal payment request was sent to me and I paid the amount. Afterwards, I wanted to double check that the shipping address was correct, so I e-mailed back. After 3 days of no response, I e-mailed again. After 7 days, I e-mailed a third time. It's now been 10 days and I have had no communication: no confirmation of the correct shipping address, no mention whether the item has shipped and no tracking number. The only evidence suggesting that I will ever receive the pen is that the listing was removed from the site.
How long would you wait without any communication before cancelling the payment via Paypal?