Longest marathon playing a card game

The longest marathon playing a card game was 170 hr and was achieved by Axel Barth, Sarah Birke, Don Kalal, Michael Ott, Rudi Scheunemann and Sebastian Stoehr (all Germany) who played Schafkopf at Wirtshaus Spektakel restaurant in Munich, Germany, from 5-12 January 2011. Schafkopf is a trick-taking card game developed in 18th century Germany, similar to the English game sheepheading. Four players played at a time with two substitutes actively rotating into and out of the game.