I had occasion to test QVC, The Jewellery Channel and Gems TV on refunds recently as I had returns going to all three on the same day (not on purpose!) - 4th January.
They were posted by different methods so had variable delivery dates but the outcomes were as follows:
QVC - five items posted separately (grrrr!) by second class post. Three of the items had the money back on my card on 10th January. One was showing on 12th January, the last one on 13th January.
The Jewellery Channel - 15 items in a single package posted Special Delivery. Six of the refunds were showing on my card on 12th January, the other nine showed up on 14th January - can't quite figure out why they took two days longer!
Gems TV - 2 items posted second class recorded together in one package. Still waiting for money, though I had an email confirming refund on 19th January.
QVC definitely come out as winners of Anne's accidental refund test!