Around 1000 I believe, had it since launch. Though over half of that is from Smash, Kart, and Maker alone. Like 100 from Nintendoland too, my little nieces and nephews love that and always play it.
Looking through activity log, looks like breakdown is:
Super Smash Bros - 197 hours
Mario Kart 8 - 127 hours
Super Mario Maker - 119 hours
Nintendoland - 102 hours
Super Mario 3D World - 80 hours
Splatoon - 66 hours
The Wind Waker HD - 36 hours
Bayonetta 2 - 35 hours
Twilight Princess HD - 33 hours
Pikmin 3 - 31 hours
Rayman Legends - 29 hours
Donkey Kong Tropical Freeze - 23 hours
New Super Mario Bros U - 21 hours
Need for Speed Most Wanted U - 16 hours
Fast Racing Neo - 10 hours
Captain Toad - 6 hours
Pushmo World - 5 hours
Monster Hunter 3 Ultimate - 1 hour (played it on Wii and never got into playing this one)
