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You're running Windows, I assume? The "program has stopped responding"- bit doesn't necessarily mean the program has stopped working, it just means that it hasn't, well, responded. That said, 30.000 books should take quite a while to import- more than hours, if you're unlucky. It is possible that a certain book causes Calibre to choke, I'd recommend trying smaller batches and thus isolating the offending book.
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