Aric Sigman recommends that,
Children under 3 have no screen exposure
Ages 3-5: 30 minutes a day
Ages 6-7: 30 minutes to one hour a day
Ages 8-12: One hour per day
Ages 13-15: One and-a-half hours a day
Ages 16 and over: Two hours
I count DS' "allowance" for TV as the time he spends properly watching something he has chosen to watch, as opposed to if I am watching something and he happens to be in the same room, not watching it but playing with his toys.
As much as I love playing with DS, I don't think I could actively play with him all day. When he's happily playing on his own, there's nothing I love more than sitting down with a good book or watching something I've been waiting to watch.
Is there anyone who doesn't have the TV on at all in the daytime if you are staying in the house and not going out anywhere?