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FYI - the calibre "Recipes" forum is about screen scraping news/blog/rss feeds.
You've already found the appropriate command.
Single conversions can take a long time, they've been known to run for more than 24 hours.
My experience with doing multiple simultaneous conversion jobs in the GUI (there's a setting in Prefs->Miscellaneous) was that it took up to twice as long (elapsed time) to convert 20 books with 3 simultaneous jobs than converting the same 20 books with a single job. No idea if that would the true in a multi-threaded script.
BR
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