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Kindly comments on Harry Potter and the Methods of Rationality discussion thread, part 16, chapter 85 - Less Wrong Discussion
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I don't know if anyone discussed this before, but it's been bugging me for a while.
It's supposed to be impossible to bring information back more than six hours with any combination of time turners. The obvious method would be that once someone delivers a message to you from the future, you can no longer go back in time further than six hours before when they're from. This wouldn't really work. Every time you travel back, you bring the information that you were not stopped by a time-traveler. Either the time turner never works, or anyone that's going to use one will be somehow completely immune to anything a time traveler does. They could send a black hole from the future that devours the planet, and you'd have to not only survive, but not even notice. Or, at least, you'd have to have a doppelganger that appears to come back from the post-black hole future but doesn't know about it.
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.