That's a tough call. I have had one in my car that I can still smell six months later, but I usually start giving them away if they've been around for a couple months. I have a lady who only buys 1 per year! I also recycle them..I cut up the ornies and put a few pieces in with my new batch and re bake....if they are different colors it looks like stained glass. Very hard to cut up tho, I have a wonderful pair of self sharpening scissors, they are the only ones that work. I like to store the finished ornies in the same gallon ziplock bag that I used to soak the beads in, helps keep the scent strong.