The Triplicate Stone: Three Days Worth of Homework

After the stone glowed, Jon watched as more homework appeared next to the homework he already had. But just like he had wished, it was all completed. He picked up one of the new worksheets that appeared and saw that the date was for the next day. Not only was his current homework finished, but somehow his homework for the next *three days* was finished as well, even though some of it hadn't been assigned to him yet. Something was definitely wrong with the stone.