I am mostly imagining using the radio while driving, so I would not be able to actually act on anything in the moment. For me, “listen later” or “read later” only really works when I am in a curious or exploratory headspace.

That headspace is not always there. A good example is when I sit down to watch something on a streaming service and end up browsing for ages instead of committing to anything. In theory, that would be a perfect moment to actively review things I have saved, but in practice I am not convinced my neurodiverse brain would reliably cooperate.

So to your question, I think I would lean much more toward a context-based mode than a time-based one. A fixed daily slot would quickly turn into another obligation. A lightweight “I am in curiosity mode right now” switch feels closer to how my brain actually works, especially if the radio-style playback keeps the cost of re-entry low.