Remember, many eBay sellers keep regular business hours, and some do not respond to emails during the evening, on weekends, on holidays, and so on.
It should also be noted. Most eBay Sellers have Real World jobs, which limits them to evening hours, during the weekday. And because of family demands, many may not be able to respond on weekends or holidays.
eBay has this rule, because, both the Buyer and the Seller can have issues that will delay a response.
Some of the many reasons, eBay allows a Three Business Day wait are.
1 ) Computer crash (dead computer)
2 ) eMail sever is down
3 ) ISP is down
4 ) Other sites needed to supply info are down. IE USPS International Rate Calulator
5 ) Computer virus
6 ) Hijacked account (there are over a 1000 eBay accounts hijacked on eBay every day)
7 ) Unexpected real world job issues
7 ) Family issues
8 ) Illness
9 ) Power outages
10 ) Flooding
11 ) eBay system bugs like:
a ) Messages sent using My eBay are not received by the buyer/seller.
b ) Internet Explorer crashing, due to system changes to My eBay.
And there are a lot more reasons and the above reasons do not apply only to end of auction emails.
I personally sometimes wait a half day, whole day or even well into the next couple days so that I can sit down for an extended period and reply to emails, personal messages, etc. all at once. Some people may have the luxury of being able to work at a computer constantly but I am not one of them. I may intermittently check the new threads on slowtwitch throughout the typical workday on my phone but that is quite different than having the ability to sit and type a paragraph-long reply to someone on an actual computer. So what is the etiquette on this?
a) 1 hour
b) 6 hours
c) 12 hours
d) 18 hours
e) 1 day
f) 2 days
g) 3 days
h) greater than 3 days