don't worry about the hay.. its all fiber... you dont want to keep them from eating, and then have other issues arise [not that i'm saying they will, but i would be worried about that..].. like star said, they won't over eat.. my dishes are always full, sometimes they empty them and sometimes they don't...
and my chinchin well he's my little porker.. lt me tell you if he's out of cage playing and i refill their dishes, he goes back in to eat hay... hahaha... and he's not overweight.. i call him my porker cuz he's my biggest chin..a bout 850, but not overweight.. he loves his hay!!!!
lets see free time or food...hmmmmm
j