For the first time I can think of possibly ever, just cancelled a flight to save a few bucks ($10) from the sale that posted today, and a flight I bought a few days ago (> 24 hrs) didn't credit back to wallet immediately.. Not typical, but a data point that it can take longer.. Decided to put more $$ on a card to keep my seat assignment, but I may have just left things alone for the low savings if I'd have known it wouldn't be instant..