It did work in the end.

Although the transaction record showed 4 days since sale, it does go by the actual time stamp of the transaction.

The buyer bought the item at 6.15pm 4 days ago, so I just had to wait until after 6.15pm this evening and it was fine.

Tippytoes - I couldn't see a timer countdown, but still had the email record which showed the time of sale.

 All good