my ds and dd both 11 have just started secondary school so now it's very different. We are all generally home by 5.30. The routine I'm trying to put in place is I start the tea, they change from school uniform, hang up, prepare bag for the next day and then set the table. If tea is still cooking they will either watch tv/play on wii/play on ipods for a little while, we all have tea, then clear away, the plan is that if all that has happened by 7 then can have an hour to do what they want to. This would generally mean 5-6 hours in weekdays and then weekends, they usually watch it when they get up then a bit longer until I'm ready. If we have something planned then we'll do that but generally Saturday is the day that they will watch more, however even if you add all that up it still only comes to 10 hours a week.
I'm the same, no gadgets upstairs.
Homework they will do at homework club which finishes at 5 for ds and 4.30 for dd. Any remaining homework done when they get home or on Saturday/Sunday depending upon what it is. At the moment there's a lot of covering/decorating their new books.
I agree with justashopgirl I don't ban unless it's for a punishment, it's much better to do other things which distract or fill their time, eg. find a good book, go for a walk, park, go out and about. TV is just a fill in to my mind for when the adult needs a break or lie in but it's also good when the kids have had a challenging week/tiring week at school to catch up with their rest and chill out for a bit.
Of course like probably loads of other families, we need to get more exercise but after working full time and keeping the routine going of uniform, preparing lunches, preparing tea every night and washing up and drying up on your own, we all need that chill out time so tv is a good tool to be used but not abused. It's nice to say you help me with this then we can all sit together and watch a movie and cuddle up.