I have never put a set limit on the amount of screen time my kids have but I have friends who do. By screen time i mean games and TV. The reasons I don't are:
a) my friends' children who do have limited screen time seem to become obsessed with it and seem to crave it more.
b) I want the children to learn to regulate it themselves - deciding when they've had enough and learning the hard way that they miss out on other stuff by becoming engrossed in ds games etc.
c) I think a daily limit is hard to enforce consistently. There are days eg. if it's wet outside, children particularly tired them it might be appropriate for them to have a bit more. And in the summer when they might be playing out they might not want it at all.
d) We are usually busy doing other stuff so they would never have the chance to spend most of the day in front of as screen anyway.
I would obviously never allow them excessive periods of time in front of a screen but there is no set time limit.
AIBU?