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By erasing those search files (some form of indexing), the kindle needed to recreate them and that entails more indexing. As mentioned that takes power and how long depends on how many books and how large. Also, I have read that occasionally a book or books could stall the indexing process and potentially even books that made it through before.
I'd think that one should not be erasing those search files all that often unless the unit is really slowing down. And when you do so, use the charger and plan for a longish process.
I know Amazon suggests that it can go a long time between charges but you may be pushing your luck if you plan on a month. The US cord and adapter are pretty small and could easily fit in a travel case.
Enjoy the trip and Kindle.
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