I'm not sure since when did 3 days became so annoyingly unbearable.
I remember when I last brokered a domain right here on DNForum (without commissions, just helping a friend), the seller (a member here) was a *little* bit impatient (after not hearing from the buyer for I guess only a few days); I already found THAT annoying.
The truth is, very few people eat, sleep and breathe domains 24/7. Most people have life beyond domains, Internet or computer, like family, job, or friends. Take that case of my friend again: he is a really busy businessman (with a forum busier than DNForum among other things). So to him, a domain sale (of less than a thousand dollars) is way off his priority. And I had to personally make a guarantee to "comfort" the seller (as in "I will pay you if he does not") . Of course, the buyer paid in less than a week. If you ask me, the seller is quite fussy, esp. when nobody else is bidding on (or even interested in) that domain during the said timespan.
There is an old Chinese saying: money doesn't come through a fast (revolving) door.