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I think a coworker of mine who loves the darkside might have 10k-20k in his Calibre library. I've got about 7500 in mine, and it's still quite fast. I have to say the worst of it is the effort required to get all the metadata downloaded. I've got about a thousand KDP freebies needing the metadata downloaded (thanks, ATDrake!), and while you can run a mass update, I prefer to check each book so that I can fix the cover if necessary.
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