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Ah, yes! Thank you. I once found a really good explanation of the CSV 512 second granularity vs blocks but could not resurrect it while working on this post. (I seem to remember it from learnmeabitcoin, but couldn't find it there and had to settle for BitMex's explanation).
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65535 / 6 (blocks per h) / 24 (h per day) = 455
"targeted days worth of blocks" (though that of course doesn't mean that it will actually take 455 days for that block height to be reached.)