Layla is in love..

... with her new Everlasting Treat ball that she got from the GE last night. She didn't leave it alone for 3 hours straight! When I finally took it away there was just a little ring of the everlasting treat left. Not so "everlasting" after all

I think I'm going to try putting some of her brand new treats in it too when I give it back.
So my question is:
How often do you replace the everlasting treat?