It depends on the games you're playing or applications you're using.
For Assassin's Creed 3, I've spent about 5% playing on the TV and 95% on the GamePad. Playing AC3 with Off-TV Play is just awesome.
Same goes to NSMB.U.
With ZombiU, it has to be 100% on the TV 'cause it requires the tv to play it, being the GamePad as your second screen.
Same goes to NintendoLand, but some games like Pikmin Adventures and Zelda: Battle Quest doesn't realy require the TV to play those games; just on the GamePad.
For Internet use, watching a a movie, tv show, YouTube checking stuff on Miiverse, etc, I would say an average of 50%.
Wii U Demos in *FPS* View ;)
http://www.youtube.com/user/PxDxI







