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My understanding is that it takes at least a month before amazon reviews the changes and decides whether the new edition warrants an email or just the option to download the new version on the Manage your kindle page.
I published my book and then a second edition about three weeks later (a beta reader came through with some fantastic suggestions). I figure the people who'd already bought it won't bother with the update, when and if it ever arrives on their Manage pages.
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