Edit - Sorry, I did my math incorrectly. However, I still come up with only 21-28 days... At 4 minutes per song 40000 min 667 hr 28 days At 3 minutes per song 30000 min 500 hr 21 days Since the PR says at 3-4 minutes per song, it would seem like 24 days would have been most accurate. 35000 min 583 hr 24 day