Depends upon if I've got a new game for the system and how good it is.
I can spend 4-5 hours a day if it's a good game. That being said I'm not as young as I used to be and to be blunt I've got stuff to do, so If I play for 5 hours one day it might be a couple of days or more before I pick it up again. Unless it's a REALLY good game of course.
80-90% of my gaming is done on the wii, because, again to be blunt, the wii has GAMES on it and the 360 ect.. only have the same cruddy fps over and over. That's not to say there aren't good games on the other systems, they are just few and far between. Most of the original and fun games are on the dlc section and unless it's REALLY good, I don't participate in purchasing thin air, so those are out (on the wii as well btw). There are companies like capcom and ubisoft that make great games that are not on the wii and my 360 gets a heavy workout when those are released. When that happens my gameplay hours on the 360 match those on the wii.... the only thing is the wii gets 2-5 great titles every season and the 360 gets maybe 2-5 every 6 months, so I end up playing the 360 less simply because there are less games to play.