Longest live-stream (audio only) | Guinness World Records
http://www.guinnessworldrecords.com/world-records/373222-longest-uninterrupted-live-webcast-audio-only

The longest uninterrupted live webcast (audio only) is 52 hours and was achieved by Nescafe 3ü1 Arada (Turkey) in Istanbul, Turkey from 13 April - 15 April, 2012.