Federal prison, if you get any of it, you're going to have to do 85% of it. And the reason why I called it that is because I had a friend who got sent to the federal joint and his whole... it wasn't about him being in jail. He cried about the 85%.
In my case, the listener is often in an automobile driving to work. You can concentrate on the road while still getting an audio message that can be riveting.