Simple answer.. You can't. Length is set to be compatible with ALL OS'es that calibre runs on.
Simple Warning... You really need to be careful to NOT CHANGE ANYTHING where you are peeking. Calibre is a Hybrid database. I logs where it puts a book. You change. You disconnect the pieces. The number is another linkage in case there are similar (editions) titles
You really do not ever need to be there. Calibre has 3 ways of sending books to devices (plus the Content Server).
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