Existing users, 
TunesTimer
shows total playing time for all songs in iTunes library
Version: 1.1
Total time
Feedback Type: Developer Note
Contributed by: Friday, February 06 2004 @ 04:31 PM PST
Product Platform: MacOSX
Used Product For: Less than a month
That is correct, TunesTimer does display the total play time, which iTunes does not. Also, I will look into implementing a feature to filter out unplayed songs. That should be included in the 1.1 release.
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