Where's Kid Icarus in your list?! :o

1) Kid Icarus: Uprising 136:56
2) Ocarina of Time 3D 104:28
3) Kingdom Hearts 3D 97:39
4) Shin Megami Tensei IV 96:12
5) Tales of the Abyss 82:41
6) Resident Evil: Revelations 79:11
7) Fire Emblem Awakening 75:43
8) Theatrhythm Final Fantasy 74:40
9) Animal Crossing: New Leaf 66:10
10) Pokemon White 61:07
11) Mario Kart 7 55:48
12) Pokemon X 53:55
13) Shin Megami Tensei: Devil Survivor Overclocked 53:47
14) Monster Hunter 3 Ultimate 41:54
15) Paper Mario: Sticker Star 36:45
16) Radiant Historia 34:36
17) Phoenix Wright: Ace Attorney - Dual Destinies 34:33
18) Project X Zone 34:13
19) Legend of Zelda: Link's Awakening DX 33:20
20) Rune Factory 4 31:05

edit: Surprising enough, my top 20 has more hours on it than OP's.

Nicee

Ok, here we go top 20 software titles (I don't own 20 actual 3ds games)

1. Zelda: Ocarina of Time 3d 51:40
2. Mario Kart 7 43:04
3. Luigi's Mansion 2 42:52
4. Fire Emblem: Sacred Stones 41:26 (This game got me into FE and it's freaking awesome)
5. Internetbrowser 36:42 (don't know how that's possible)
6. Sonic Rush adventure (DS) 31:18
7. 3ds-camera 27:33
8. 3ds-sound 24:05
9. Super Mario 3D land 21:50
10. Zelda: The adventure of Link (super awesome game)
11. Shinobi 3ds 19:57
12. Zelda: Minish Cap 17:26 (own the cartridge too)
13. eShop 16:36
14. Mario Kart DS 15:01
15. Super Street Fighter IV 3d 14:32
16. The Legend of Zelda 7:34
17. The Legend of Zelda: Spirit Tracks 7:14
18. System configuration 5:51 ( )
19. Nintendo Video
20. Star Fox 64 3d 4:52

Edit: My most played games of all time are Pokemon Diamond Edition 690 hours and Sonic adventure 2 battle ~200 hours

Some of you guys have ridiculous times on the games. I usually play a game and then move along to another game. I'll eventually come back to and replay games I like, but that's after I play other games first.  Here's my top 10 since about 16 or 17 it gets to how much time I've spent on eshop, etc.

SMT4 51:53
Pokemon X 44:29
Devil Summoner Soul Hackers 38:28
Suikoden Tierkreis 28:35
Dragon Quest 9 24:52
Lords of Shadow Mirror of Fate 22:51
Theatrhythm Final Fantasy 16:50
Etrian Odyssey 4 13:42
Shinobi 11:07
Super Mario 3D Land 9:50

1. Mario Kart 7 - 341:07
2. The Legend of Zelda: Ocarina of Time 3D - 330:48
3. Pokémon X - 101:56
4. Super Mario 3D Land - 56:17
5. Fire Emblem: The Sacred Stones - 39:01
6. Mario Kart DS - 37:20
7. Super Monkey Ball 3D - 24:37
8. The Legend of Zelda - 23:04
9. Mario Tennis open - 21:14
10. WarioWare inc.: Minigame Mania - 17:15
11. Super Mario Bros. - 8:22
12. Excitebike - 8:09
13. Luigi's Mansion 2 - 7:18
14. AR Games - 5:49
15. Mario Kart: Super Circuit - 5:32
16. Face Raiders - 4:23
17. Zelda: Four Swords Anniversary Edition - 4:14
18. Mario Party DS - 3:36
19. Balloon Fight - 3:32
20. Wario Land 4 - 3:05

And excluding AR Games and Face Raiders:

19. Wrecking Crew - 2:51
20. The Legend of Zelda: The Minish Cap - 2:06


Though it should be noted that a few of those games (Wario, primarily) wasn't played by me.