The hole has eaten all of the gravel it can hold, and it has leftovers on the driveway. We have come up with a couple of possibilities of other places that might be hungry, but who knows how much those places can hold.
It was fed as much as it thought it could hold, but then that was pushed down and it was fed some more. Its second helping was also smashed down nice and tight.
We are hoping that it didn't get served as much extra sand as it did gravel. We also decided the sand needed some protection from the elements until the hole can digest just a little.