Tag. Gonna post mine later today.
My memory sucks...
|2||Mario Kart 7||131:48|
|3||Ocarina of Time 3D||102:58|
|4||Pokemon Soul Silver||55:16|
|5||New Super Mario Bros. 2||54:52|
|6||Super Mario 3D Land||54:25|
|7||Pokemon White 2||42:20|
|8||Mario & Luigi: Dream Team||38:01|
|9||Super Smash Bros. For 3DS (Demo) (lol)||35:11|
Luigi's Mansion 2 comes pretty close at 33:55, and I expect 2 more Zelda games to enter at some point (ALBW is already nearing 20 hours, and Majora's Mask might get to 50 if I try to 100% a few times), I just got them this year.