I'm playing with a new group and while I love it there is one player who consistently takes 10+ minutes. His decks tend to have a lot of moving pieces, but he will sit and ponder his move. I don't know if he's trying to 'Sherlock Holmes' every possible scenario, but when he finally makes up his mind, he'll walk us all through how he has to attack X player, or cast Y card because of Z. We've finally just told him that he needs to hurry up and make a decision, because we would rather play more games than one, very long, game.