How long to wait for an invoice? (non-pony)

[Glacia471]

I bought 2 books on ebay from a seller last night (28th), and immediately requested a total because the description stated that they do have a combined shipping policy. I still have not gotten an invoice, though I did send a second request around 6 hours ago (still no invoice), but how long should I wait before sending them a message? I want to pay them, but they're not really helping me do that Thanks in advance!

[ponylady]

Hmmm...I don't think it would hurt to send them a quick message. They maybe tied up due to the holiday weekend and have not got around to checking their ebay.

[Glacia471]

I had no invoice when I woke up this morning, so I sent them a message. I just got a response from them (and an invoice, hooray!), turns out one of their staff was out sick yesterday. I was able to pay for my books now I don't understand how NPBs can handle just not send payment, I've learned I get uncomfortable going a day or so without paying