Personally, when I'm having access to a laptop, I'd like to do stuff that I can only with a computer, such as reading (web or just pdfs) or watch some videos. Those kind of activities do not go well together with listening to audio books...

So, I'd say it's best to fill the time where there is little need to use the brain for other intellectual activities, such as when working out or doing the dishes. I do turn it off now and then though; it's nice to have all that knowledge being force-fed to you, but of course we also need some time to do some actual thinking without any such distractions. Personally, when I'm having access to a laptop, I'd like to do stuff that I can only with a computer, such as reading (web or just pdfs) or watch some videos. Those kind of activities do not go well together with listening to audio books...

So, I'd say it's best to get some portable audio player, and fill the time where there is little need to use the brain for other intellectual activities, such as when working out or doing the dishes. I do turn it off now and then though; it's nice to have all that knowledge being force-fed to you, but of course we also need some time to do some actual thinking without any such distractions.

For the narrow field of knowledge where it applies, audio books are as close as it gets to a (slowly-working) knowledge pill, I suppose...