I'm not totally consistent on this. Sometimes 5 days, sometimes 10. I consider the size of the prey items I have on hand, the last time the particular snake ate, and whether or not they are exhibiting signs of hunger. If I go in there after dark 4 days after the last feeding and everyone's heads are poked out of the hides poised to strike, I offer. If they're in shed, they typically won't display this behavior so I don't offer.