Listening to Podcasts=Working?

I was away on the weekend, visiting my mother in the North, also visiting the agency’s main office in Hamburg. On the way I was able to work on my piled up podcasts and audio books.
Let’s see, I listened to tapes of Jack London’s "Call of the wild", to Seth Godin’s All Marketers are Liars, several episodes of For Immediate Release: The Hobson and Holtz Report, Lee’s new Better Communication Results Podcasts", several episodes of the Gillmor Gang, Across the Sound #7, StevePavlina’s Podcast and G’Day World On The Pod. There might have been the obligatory minute or 20 of Morning Coffee Notes. Yes, I might have skipped the odd minute here or there, but I had 16 hours to fill and limited navigational room without one of those fancy stearing wheel controls. By the way, my 3G iPod went the distance of 6 and a half hours on the way back, and the end of which my brain was full and neeeded to be cleared by Killswitch Engage.

Back to the subject. Podcasts allow for information to be deliverd directly to my head and since most of what I was listening to related to PR, marketing, personal development and law of life in general I am debating if these 16 hours or at least parts of it should qualify as work time; advanced training if you will. Of course I know I profit but how much does an employer or  clients profit? Should time spent listening to podcasts qualify for the column "training" just like reading a book on software programming, although you might actually have been walking the dog or running on the treadmill? You’d not only have more time in the day (which you never have) but also that you could bill twice.