Hi there!
For compatibility with Apple's entire range of devices, Audiobook Builder ensures the number of audio samples in each audiobook file it builds comes in under the maximum value of a signed 32-bit number - roughly 2.1 billion. Because this is related to the number of audio samples, as you lower the audio sample frequency you can fit longer durations into a single file. At 44.1 kHz, then, you'll get around 13 hours per file. Take it down to 22.05 kHz and you get around 27 hours per file. Bottom out at 8 kHz and you're looking at 74 hours. To change the audio and Part settings, click the Finish button at the bottom of your project window, then click the Build Options... button toward the top right of the window, just below the preview of the Cover artwork.
I hope that points you in a direction that helps. Let us know if you have any questions and we'll be happy to jump in!
_________________ Keith GugliottoPrimordial Sea CaptainSplasm Software https://www.splasm.com
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