There isn't a way to start calibre and have it stop when the last job is finished.
You can have the ebook-convert command line option to download a recipe. I don't know exactly how to do it with a user created recipe. See the user manual for information on using ebook convert.
Once you have the file you can use the calibredb command to add it to the library. Again see th user manual for details.
That's the only way to use calibre with cron and have it close after it completes.
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