Daijiworld. Konkani Singing Marathon Crosses 130-Hour Milestone, Mandd Sobhann’s Guinness World Records Attempt Nears Halfway Mark Mangaluru: Mandd Sobhann’s. Mangaluru, Nov 8: The ambitious attempt for the Guinness World Record for the longest singing marathon (multiple singers), organised by Mandd Sobhann at the Town Hall in Mangaluru, has.