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Benquo comments on Harry Potter and the Methods of Rationality discussion thread, March 2015, chapter 119 - Less Wrong Discussion
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I think this is taking "6 hour limit" way too literally, when by far the simplest explanation is that time turners can protect you against Time's tendency towards simplicity for 6 hours or so, but if you try to chain that, it becomes overwhelmingly computationally simpler (and therefore more likely) for the intention to set up such a chain to result in the death of everyone involved, than for the chain to work as designed.
I agree that the scheme I propose would fail under many interpretations of how time travel works.
I disagree that we know enough to say that Time has a tendency towards computational simplicity, or that Time-Turners protect you from it, or for that matter that a Time-Turner chain is any more likely to short-circuit in some bizarre accident than a regular use of Time-Turners.
The simplest explanation I can think of under which my scheme might not work is actually the 6-hour buffer model. In that case, I expect no time travel would occur at all, so we'd want to design the scheme in such a way that (a) this is a clean way to fail and (b) this is not a failure case we expect short of either the world ending or the scheme not working.