Not a major issue, just wanting opinions
I sell items on a private site, mainly secondhand clothes, shoes and make up. Have done for the last 3-4 yrs. I've sold quite a lot over the yrs and haven't had any problems. You always get the odd one that complains over something small though.
A lady has just bought a top and some make up. She didn't message before buying (it does say on my profile to message first if they have any questions). After she bought the items she then messaged to ask how long it would take for me to post. I said Tuesday and asked if that was okay, she came back and said "hmm not really, I was hoping you'd post sooner". I explained that the post office is shut on Sundays, I'm working all day on Monday and that my day off is Tuesday. She replied and said "fine, but I'm a bit disappointed" 
I haven't replied to her and don't plan to although I am a bit worried she may leave an unfair review on my profile once she receives the items. I was thinking of offering her a refund but she hasn't specifically asked for one.
No where does it say on my profile that I post same day or next day (some people offer this service so they have more of a chance of selling items) but I can't promise that service due to work and other commitments. The site also gives sellers a 5 day timeframe to post items anyway.
AIBU to think 2-3 days isn't a long time to wait for something to be posted and she's just being an arse?