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It would take the same time as dragging or copying them to the temp folder.
When I started out with calibre I imported 7000 pdf's, epubs, lits etc. not all books, many were technical data etc. I think it took 12 hours, but I did them in batches of 1000, which I wouldn't do today.
I would group my books by source, for example Amazon, gutenburg, mobilereads etc. and import a test batch to see if the title, author are entered correctly, and hopefully other useful metadata as well. If not I would delete the books and adjust the adding books options in preferences till I got the best results.
At that point I would import a much larger batch. I am kind of intrepid, so I would go with 500 or more at a time, but depends on a persons comfort level. Then I would deal with these books, checking format, (I like all of my books formatted the same way) and carry on with the next batch.
Helen
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