I found my eldest (5) watched a fair bit when she was home with me (prob 2 hours spread out over the day), but is now at school everyday. She is a very busy/energetic girl so it was really the only time of day that she chilled for a bit/gave me a break etc. Also we did lots of other stuff during the day parks, toddler time, baking, crafts etc so I never felt guilty about the odd bit of TV.
These days she is allowed to have it on at 5pm for half an hour before dinner then another half an hour after dinner/before bath. I am not super strict with it though some days it might go on at 4pm or not at all, just depends, they are the general 'house rules'
At the weekends we will usually watch a kids/family movie in the evening at least once. Weekend mornings we have actives at the moment so no time for TV. Once the weather is nice enough to play in the garden I doubt it will go on much at all during the week.
My youngest has not got into TV yet, she is 21 months, she is better at playing with toys/pottering around (than her sister was) so we don't have it on at all. She will watch a bit with her older sister but not into any particular shows yet (she did quite like In the Night Garden a few months back, but we stopped watching it). She pays more attention if we watch a movie such as Madagascar or Frozen than kids TV.
Neither are exposed to ipads/other screens yet (we have an itouch that is used sparingly ie long haul travel or drs waiting room).