In my late 20s I drove a lot for work, and talk radio made the time pass much faster. (I've since discovered audiobooks.) Rush was entertaining. I eventually got bored when I realized he kept recycling the schtick.

There are some pundits I follow now who keep beating the drum for certain pet issues - Dean Baker and Paul Krugman, for instance - but that's more documenting the ongoing repetition of Republican talking points. I don't think I could listen to three hours of that daily, even though I agree with them.

Point being, I think there's something in your personality that determines whether you can keep listening to the same thing all the time.