dunno, around 3-5 hours per day, but i remember that, back when i first got my wii, i used to play 12 hours per day trying to complete zelda:twilight princess and super mario galaxy
some nights i would stay up all night because those two games were so addictive
basically, its not drugs the government should be banning, they should put a daily time limit on wiis because they are
really addictive