I bought Franklin a new interactive toy today, he has about a million, but so far this one has lasted for over an hour! All of his other treat toys combine usually take him less than 1/2 hour to get all the treats out, so the idea that one toy would last 1+ hours is beyond amazing. Its made by Nylabone, here's a link

http://www.nylabone.com/product-finder/by-product-type/treat-holdem...

I cut a piece of chicken jerky into a bunch of small pieces and put them inside and he is absolutely in love with it and has been working on it non stop for over an hour. Its an amazing toy and totally worth the cost.