I may be too old school, but one thing that the internet has drastically changed is how impatient everyone is.
A couple days wouldn't bother me.
I bought a bike from a guy in Italy... Paid, waited.... at about 3 months a guy here that occasionally listed stuff for the guy in Italy listed a pair of wheels that would have gone with the bike. (Special bike used by a know pro, same special wheels from the same rider)
So I asked if there was a chance they ahd come from the bike I'd bought, but maybe had gotten shipped wrong or forgotten.
No problem, a spare wheel set. The US guy said he knew the Italian guy still had the bike, had packed it but just hadn't gotten around to going to the post office.
He gave him a gentle reminder that people in the US were a bit more impatient than in Italy, and my bike was on it's way.
The only thing that keeps stamp people from being slow is that stamps are so small and light...