As its name implies, All of Creation exists within it. Every grain of sand fluttering in the glass, slowly trickling from top to bottom, is every possible universe. The hourglass keeps track of the movements of each world and maintains their relative progression of time to one another. Each worlds time is only consistent to itself: as they trickle through the vast emptiness that exists within the Hourglass, each world may move faster or slower relatively to one another. It is a constant shakeup. One world may age ten-thousand years in the time it takes another world to age only a minute. Then they pile into the great big heap at the bottom of the Hourglass, and when it turns, their relativity changes. Their relative time could shift in all sorts of ways: the slower one may age near infinitely faster, the faster one may exist in the exact same timeframe as the slower, or nothing changes between them at all! All that really matters is how fast the worlds are going to determine how fast their time is moving. The hourglass itself is nothing special, if it gets broken and every world spills out into the floor or between the cracks of the oven or onto some delicious Sashimi someone is about to eat or into a letter that is being mailed through the very ineffecient USPS, then time progresses when their grain move and stops when their grain stops.
Try to imagine the Hourglass as only an Hourglass, a container for timekeeping. There are major concepts we won't go into such as Constants, though I'm sure those of you with strong imaginations may figure out most of the complexities related to Spacetime with the THOAC (pronounced Thwack) without a primer. I hope this has been as informative as you need whenever you have stumbled onto this particular section of Mr. Dtabog's journey.
Does the Hourglass of All Creation contain the Hourglass of All Creation?
The Hourglass of All Creation includes all of creation EXCEPT itself, this implies the existence of a greater Hourglass of All Creation that includes itself, which we'll call The Hourglass of All Creation Including Itself .
The Hourglass of All Creation Including Itself contains all of creation including itself, which implies the existence of a greater Hourglass of All Creation Including Itself which contains the original Hourglass of All Creation Including Itself.
Because two Hourglass of All Creation Including Itself cannot exist at the same time, each Hourglass of All Creation Including Itself must both be and not be the Hourglass of All Creation Including Itself at all times.
Thus it's a superposition.