Originally Posted by Andybaby
but then wouldnt you need 20 Cds to do 30 hours of Audiobooks?
Yes... it will take multiple CDs. I think a CD can hold about 90minutes of audio. But, most books are 5-7 hours... so usually 3-5 CDs per book. Yes, there are exceptions.
The best bet of course is to have a device that supports the .aa format. There are a plethora of them. Several that you can get for under $50.