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Qiaochu_Yuan comments on Harry Potter and the Methods of Rationality discussion thread, part 21, chapters 91 & 92 - Less Wrong
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Why is Harry looking at his watch so frequently? And why was he so insistent on a particular deadline for people not bothering him? He seems to be paying an unusual amount of attention to the time, and that suggests Time Turner shenanigans, although I'm not sure what they are.
He needs 6 hours of uninterrupted time with Hermione's body. His present self guards the door while his future self does whatever he plans on doing to prepare her body for long term preservation.
See this quote from chapter 91 set right after Harry exits the room where her body is stored:
That "lifetime" is more specifically 6 hours.
"Lifetimes" could also be literal (though this is a bit dubious considering that it's from McGonagall's POV) - perhaps Harry managed to reanimate Hermione for multiple brief periods? Or, perhaps Harry experimented with animating, killing, or reanimating other, smaller creatures?
I highly doubt that he would mess around with her body more than necessary. He knows that he doesn't yet have the knowledge or power to resurrect her, and any experimenting will have to be done when there isn't a limited time-frame to stop her body from deteriorating further.
My current best guess as to what happened in that room is that Harry spent a good deal of time transfiguring her body into an element so stable, that the atoms won't move around "too much" in the days/weeks/months/years he would need before being able to resurrect her. He then transfigured a replacement body from some dirt lying around.
It's also possible that he just transfigured her brain into this element and just left the rest of her body as it is.
Alternatively, he could have simply entered the room and watched the room for six hours, perhaps while random-walking. By doing so, he ensures that the only observer he needs to worry about himself, so that far-future Harry can plan a time travel trip in security.
I highly doubt he would do that as well, given that there is no known method to travel further than 6 hours back in time. He would not base his entire "save Hermione" plan on a hope that he could somehow find a way around this constraint.
What he does at this very moment should exclude as few plans to save her as possible, and not preserving her brain would exclude almost all of them.
Also, given how time travel works in this story, the only thing he would achieve with this is making it impossible for future Harry to do any changes at all to Hermione's body in these 6 hours (since he can only "change" what he doesn't know).
The former is granted; better to be sure. (Though any trick that can overcome information-theoretic death has a decent chance of allowing arbitrary time travel anyway.)
The latter, however, is easily dealt with: show up under the Invisibility Cloak, hit his past self with some variant of the Confundus Charm. Since he's watched the entire 6 hours, he can be certain this will be sufficient.
... except he can't, because someone else could've pulled the same trick. Nevermind; retracted.
I do not see how that would follow at all, could you please explain?
Dumbledore has already told Harry that he tried a variant of this once and that it didn't work. "Time" didn't like that. See this quote from chapter 90:
This should at the very least be considered weak evidence to not "mess with time" in the way you're suggesting, and Harry will not go for a plan when he only has evidence against it being the best solution (this + time travel is constrained to 6 hours + not preserving her brain will make "easier" plans to save her impossible).
This is not how time-travel works in this story, he doesn't need to watch her to do it. The less he knows about the situation the more he can "change" it, so the absolute smartest thing he could do if he planned this is to stay as far away from her body as possible.
Reversing information-theoretic death is fundamentally the problem of taking a bunch of atoms in random configurations and getting a person out of it - and not just any person, a particular person about whom you no longer have any data whatsoever.
This problem is fundamentally equivalent to time travel: if you can time travel, you can just go back and copy the original, and if you can reverse information-theoretic death, you can "resurrect" the visible universe at whatever time and put yourself in, essentially, a simulation of a prior time.
Actually, there's a stronger example from the Standford Prison Experiment arc, which is why I already retracted this point. (Though why it doesn't work is still a legitimate and interesting question.)
A person is a good bit smaller than the visible universe.
I agree that if you solve time travel you can also solve death, but the other implication does not hold. A possible way for Harry to "resurrect" Hermione is to scan her brain, run it through an error-correcting algorithm (to reduce/remove errors introduced from decay and it being transfigured) and then "print out" a brain that is arbitrarily similar to Hermione's brain at the moment of her death. This will of course depend on the amount of computing power available to Harry, but since he is already "destined" to tear apart the stars, that will probably not be a problem. It'll also require some "minor" scientific breakthroughs.
Now, I am not at all saying that this is Harry's plan to resurrect her (In fact I suspect his plan to be very different from this), I am merely providing an example for how you can "restore" someone who is dead without being capable of time travel.
The answer s much simpler I think. He has precommitted to stay there until dinner, but the process of thining over his failures is deeply emotionally unpleasant so he really wants it to be over.
One point for parsimony. Minus one point for failure to properly model the character.
Nice idea.
If Harry wanted to do something rash to get Hermione back, messing with the Time Turner would be considered "rash". Also, Harry did conveniently manage to get his time turner unsheathed.
Harry tries something with his time turner. Harry gets a note - "Don't." Harry writes on the note, "Give Hermione back, or kiss my ass - take your pick."