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Actually, Kindle devices have a built-in offline full-text search feature that allows you to find any word or phrase (including character names) that appears in all downloaded content on your device within seconds.
To enable this capability, the Kindle runs a background service that parses and indexes newly downloaded content. This process can consume a significant amount of resources (CPU, memory, and battery). The larger the content (e.g., lengthy books), the longer it takes to finish indexing. In extreme cases, your Kindle may even run out of battery before the process completes.
If you plan to take your entire library offline, it’s best to download your books in small batches. Indexing a single book can take a few minutes, while indexing 100 books could take 2–4 hours. Be sure to check your Kindle periodically to ensure the battery isn’t running low and the device hasn’t crashed.
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