I'm also between the second and third dungeons right now, and I think I'm at about thirteen or fourteen hours. The other night I was playing WiiSports with my friends, and they asked to see Zelda before they left. I showed them, and when they left it, I played it for about four straight hours: to 5:15 in the morning. I played all the way through Kakariko Village (I'd saved at collecting twilight bugs, so I finished that), mounted battle, sumo wrestling, Death Mountain, the entire second dungeon, and maybe a little bit more. I am loving this game.
Nintendo must have known how much I loved rooftop hopping in Ocarina of Time's Kakariko Village. I love the design of the new one, climbing as high as I can, shooting arrows into poles, hot springs; it felt so awesome to restore the town, to see people in it. One of my favorite things about Zelda.
I can't play for the entire week, because I'm at school and left my Wii at home. But come this weekend, I will play hours. Hopefully up through the third dungeon.