I'd like to listen to audiobooks when I run (and when I fall asleep). I'd like to use my Forerunner 965's ability to play MP3s for both of these use cases. Since audiobook chapters (which are showing up as songs on the watch) are frequently about an hour long and because I fall asleep while listening to them, I need to be able to fast-forward and rewind through them to find my "spot." I'd also need to be able to set a sleep timer so that the content stops playing automatically after (in my preferred case, 30 minutes). Audiobook apps for phones generally provide multiple sleep timer options (5, 10, 15, 20, 30, 45, 60, 75, 90 minutes and end-of-chapter on the app I use most).