Ouch, that first one is definitely a bug. As for duration, that's definitely something that's missing and we can fix it by showing a proper timeline. You can already click on someone's profile to listen only to their answers, but we could make that easier to find and do as well.
Short, dense podcasts aren't unusual. Scientific American's "60 Second Science" is a good example. "NPR News Now" is just a few minutes long and updated hourly.
It would be nice if I knew how far along the individual clip one is. The background for the currently playing segment should be highlighted.
Since this is a multiparty QA, it would be nice to be able to listen to just one person's answers.