Kindly comments on Harry Potter and the Methods of Rationality discussion thread, part 16, chapter 85 - Less Wrong Discussion
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You're right. In fact, in the story we already have questionable use of information travel:
If there were a hard limit of some sort, then Dumbledore wouldn't be able to go back more than two hours after hearing that question, no matter what, because "there will be information in 4 hours" is itself information. The limit is somehow more complicated than that, which opens it up for abuse.
I expect this to be a plot point eventually.