[soperj]

There can't be an infinite number of marbles in a finite amount of space.

[a257]

The number of possible states asymptotically approaches infinity, so we can model it as such. You can get a more "accurate" model using more math (with measure theory), but the terms will coalesce such that they are negligible.

[soperj]

negligible isn't zero, and time at a universe scale may be longer.