This is a good idea but what if you have a jw zealot mate sitting next to you all 3 days? For those who have to go through this with someone who is a strict "believer".
The mp3 would be good in your case because the program is broadcasted on FM radio. Tell the zealot that you are listening to the program, then turn on some music or even an audio book. Or you could tell the zealot that you are volunteering and go sit in the car, at the cafe or the hotel if it's in walking distance.