I got carried away and ended up doing everything over 10 hours, I was surprised I had so many.
A couple of those I am still actively playing so they will make it further up the list and it seems the games I got early got alot of play (because there wasn't a whole lot to play back then)
Captain Toad - 11 hours
Assassin's Creed Black Flag - 14 hours
NintendoLand - 14 hours
Deus Ex - 16 hours
Rayman Legends - 17 hours
Miiverse - 17 hours
Splinter Cell Blacklist - 17 hours
The Wonderful 101 - 23 hours
Bayonetta 2 - 23 hours
Trine 2 - 24 hours
DK Tropical Freeze - 25 hours
Smash Bros - 27 hours
e-Shop - 30 hours
Need for Speed MW - 31 hours
Runner 2 - 40 hours
Windwaker HD - 40 hours
Pikmin 3 - 41 hours
Batman Arkham City - 47 hours
Super Mario 3D World - 60 hours
New Super Mario Bros U - 73 hours
Internet Browser - 136 hours
Mario Kart 8 - 341 hours