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Take up a ton of time. I would never actually sit down and do nothing but listen to podcasts. Still, while exercising and doing chores, I was listening to podcasts.
I also listen to them while driving, preparing meals, doing dishes, etc.
More importantly, podcasts take up brain space! I have a limited amount of time and brain space, and I need some empty room (while exercising, doing chores) in my brain to ruminate, to let ideas stew, to allow ideas to percolate. Ideas that are related to MY PROJECT as opposed to these podcasts (interesting though they may be).
But you're right, sometimes those times are needed to allow your brain to stew. I should take this into consideration.