Mins not hours!
I put three kibbles of dog food into each part of the puzzle the first time I gave it to my 4 yr old Lhasa Apso. As I put it on the floor I set off the stopwatch on my smartphone. 2mins 7seconds later he sat down and looked at me for more. I bought it to slow down his eating as he's a scoffer, this will work for that, but as for hours of entertainment, well as he today, he is doing it in 52 secs. (It only arrived lastnight) judge for yourself