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Old 03-29-2011, 02:23 AM   #2
itimpi
Wizard
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Posts: 4,109
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Join Date: Nov 2008
Device: Sony PRS-950, iphone/ipad (Marvin/iBooks/QuickReader)
As far as I know there is no way to directly derive the length of an ebook file without actually opening it and parsing its contents. The file size can be a very rough indication, but that can be heavily affected by both how text has been formatted, and also whether there are embedded graphics.

I do not recall any interest expressed by any of the calibre developers in having such a feature. This matters as since calibre is open source, features only get added to calibre if someone is interested enough to work on them. Of course I could be wrong there and your post could spark off interest.
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