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at 1 try per second it would take at most 4 583 812 339 years!
That's with a 10digit alphanumeric as per howard's calculation of permutations.
Tell your group not to use built in storage or a storage card for sensitive data, that way as howard says, if it's hard reset, the data is gone (of course on that note make sure they backup frequently as well). Alternatively, you can use an encryption app to encrypt sensitive documents.
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