I feel your pain on needing a toy that lasts longer than 20-30 minutes!! I came home from work one day to Ms. Penny chewing on the floorboards of my bedroom (she had escaped from her kennel, one of her many talents!)!! Needless to say, I had to call a Boston handyman
to put my house back together, as well as find an alternative chew-toy for Penny, as I was not interested in redoing my floorboards again! I have used peanut butter filled toys, knuckle bones, puzzle toys and rope toys, all of which keep her occupied and keeps her off my floor boards!!