When do they expire? Seemingly never, at least on my Citi Reserve card! Fortunately I do not do long paid stays at expensive properties, but for a road warrior or bigshot business traveler I could see it becoming a problem fast. I've had them hang around for a month. One would think that given the relationship between Citi and Hilton, it would be in their best interest to sort this out, lest it be a deterrent to putting business on Citi hhonors cards.