Longest marathon singing by a choir/group

According to Official Guinness Records,

The longest continuous concert by a choral group is 31 hr 45 min, by the Durg - Bhilai Lifecraft singers at the Kalamandir Civic Centre, Bhilai, Chhattisgarh, India from 5 to 6 February 2005.
They sang traditional prayers, rather than pop songs.

For a complete list of 2005 records, please visit 2005 Guinness Records in India.

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