The duration of these games depends on the number of players, the complexity of the rules, and the luck and skill of the players. Some of these games, such as Slapjack, Matching, or War, are quick and easy to play, and can take only a few minutes. Some of these games are more challenging and strategic, such as Rummy, Double Solitaire, or Dungeon Mayhem, which can take up to an hour or more.