Longest marathon playing Mahjong

According to Official Guinness Records,

The longest marathon playing Mahjong is 33 hr 3 min 48.58 sec and was achieved by Oleg Petrov, Anton Khantimirov, Mark Efremov and Nickolay Demyanov (all Russia) in the exhibition center "Sibir" in Krasnoyarsk, Russia, on 14-16 December 2012.

For a complete list of 2012 records, please visit 2012 Guinness Records in Russia.

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