I recall a bookmark with an octopus page-turning through eight different books*. The odds that he could read that many at once are as low as those that suggest he would be finishing the page in all eight simultaneously.
LAUGHABLY LOW.

Also, I hope your kids are in constant danger of novelanches.

*It didn't say, but should have said, "Books are Tentacool!" or "Reading is Octopodiforme(ē)!"