It all depends what they said on the auction. Did they specify they would post within 1 working day? I post within 24 hours of payment, but sellers do have 7 days to dispatch as per paypal rules. Posting any later than 7 days is lax in my view.
It says delivery within 2-3 business days, including time to dispatch, for 1st class, I double checked. Messaged them yesterday am asking them to check but no reply yet. Just a polite enquiry pointing out I had paid to upgrade to quick delivery and it hadn't yet arrived. (I knew it was too early to be lost or anything, just seemed slow to arrive IYKWIM)
on the listing it is how long before dispatch on order detials it is estimated arrival time, my listings are set up as post within 3 business days, i don't go to post office every day, so when you pay if second class will give estimated time of arrival as 6-8 days 3 days to get to post office and 3 days in system ( royal mail aims to get about 80% of 2nd class delivered in 3 days )
so if says 3 days for dispatch then that would still be 4 days so pay thursday lunchtime packed friday posted monday, here you could post in village at 2pm on monday but it would have tuesday postmark as parcels are collected about 12 so would not technically be collected till tuesday then arrives wednesday
alot of businesses on ebay are people working from home so still may not be posting every day, but wait and see what they say, that's why I do not offer first class what is the point in next day delivery if it takes 3 days to get to post office