Animal Crossing: 578:25 (wow!!) 716 played, 0:48 average playtime
Tomodachi Life: 378:38 , 431 played, 0:49 average play
New Style Boutique 106:02, 203 played, 1:00 average play
My highest average play is Fantasy Life with 2 hours.
1. Animal Crossing (137 hours)
2. Harvest Moon: A New Beginning (53 hours)
3 ....um....Nintendo eShop.... (8 hours)
I'm not sure how I accumulated that many eShop hours. Maybe I was downloading something.
My next actual game is:
4. Paper Mario: Sticker Star (8 hours)
1st: Animal Crossing New Leaf: With 414:55 Playtime
2nd: Pokemon Y: With 103:18 Playtime
3rd: Tomodachi Life: With 86:57 Playtime
4th: Pokemon Alpha Sapphire: With 54:51 Playtime
5th: Fantasy Life: With 47:21 Playtime
Animal Crossing: New Leaf (332:30)
Fire Emblem Awakening (80:36)
Kid Icarus: Uprising (75:55)
Tomodachi Life (73:08)
Prof. Layton & the Miracle Mask (42:01)
I used to share my 3DS with my little brother, so the Kid Icarus hours are all his, but I did contribute to the Fire Emblem Awakening hours. The ACNL hours are basically all mine, save for a few he put in. Professor Layton & the Miracle Mask was played a total of four times, twice by me and twice by two of my brothers.