lilolpeapicker, They last forever. We have 2, keeps her busy for quite a while.. This is our second set though, she has a set for outside in the summer. They get kinda dirty so we keep one set in the house. I give them both to her at the same time. I found some tiny treats that fit perfectly in the ends, 2 in each end. Blue Dog Bakery Perfect Trainers. She usually doesn't get all the goodies out before she gives up. I just leave it in there, loosen it with a knife and stuff more in.