3 to 5 hours of drving a day? Ouch!Well, you can always buy lectures on tape/cd, and play them while you drive.
Unfortunately I don't have a tape player in my car (I'm eventually going to change my tapes into CD format), but for anyone who does I'd recommend the Sum & Substance lecture tapes you can find at most legal bookstores. I think you can even find them used at places like amazon.com and the like. Hope that helps!