I remember a similar discussion last season. There were quite a few hunters who left their ducks, either in the fridge or outside(if it was cold enough) for a couple days up to a week or more. The key topic seemed to be leaving them breast side up, in order to drain the blood from the breast meat. I tried it for a few days last year and the meat was great. Whether or not it made it better than cleaning them right away, I couldn't tell too much difference. If your just doing pepperoni or something similar, you might as well just clean them right away. But, if time is the issue, it's not going to hurt if you wait a few days.