doesn't export entire clip

I merge audio books into one long track. Some of my books are up to 47 hours long. Today however I have a book that I have merged that is 13 hours long but it will only export 5 hours of it. Whats up with that? I’m windows 7, I’m using Audacity version 2.0.1 and I downloaded directly from the site.

If you’re exporting as a WAV file, the WAV format has a 4 GB size limit (may be only 2 or 3 GB on some computers)
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