04-10-2020 8:27 AM
eBay says you have 48 hours or until the end of a listing to respond to an offer yet messages me to say an offer has ended as it's only valid for 24 hours!
https://www.ebay.co.uk/help/selling/listings/selling-buy-now/adding-best-offer-listing?id=4144
it's up to 48 hours,
the person making the offer can change the time scale
it will tell you on the offer how long you have to respond
ebay have only recently changed it to allow the buyer to choose the duration of the offer, so the help pages haven't caught up