It's only about a half hour. Even less if you're quick with the 15 second skip button. I automatically skip the first 2 minutes of intro / ads every episode. The episodes are also generally the same structure during the week. So if you want to hear instant reaction you listen to the next day's episode. If you want game film analysis, you listen to the next day. Then usually mailbag questions the day after that. Then crossover episode with the next opponent's host. Then injury update and predictions.
I highly recommend it, but if you only have time for one or two a week you can pick the ones that are most interesting to you.
Edit: I should note that I usually listen to the episodes the morning after they're posted but he actually posts them in the evening. So the instant reaction episode will be posted the same evening if the game is during the day, etc.