I have an opened bag of Goldfish crackers on my nightstand that has been out for several days and I've been snacking on them almost daily and they are fine. I also have a bag of cheetos on the floor next to my bed that I opened 2 nights ago. I haven't had any since but I'm sure they are still fine. Even if they are a bit stale they arent harmful to eat. I got them from an international market out of state so they are an unsual flavor so its not something I'm just going to throw out