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Minutes Played: stat.playOneMinute
Via: http://minecraft.gamepedia.com/Statistics
the game divides the number by 20 to get the number of seconds played and then by 60 to get the number of minutes played.
Source: https://bugs.mojang.com/browse/MC-29522?focusedCommentId=153354&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-153354
See: http://minecraft.gamepedia.com/Tick