Life sometimes gets in the way, I'm usually the buyer & 24hrs is prob the longest I've taken to pay. As a seller (my one & only offer to sell) I was ghosted, even a polite 'sorry I've changed my mind' is acceptable from a seller or a buyer IMO.
FYI, if you accept someone's offer please reply by message, quite a few times my offer has been accepted & I only found out by checking my emails (just as well I'm a needy bugger & check them a few times a day).