My DS is only 9mo - but I put on Sesame Street and Cat In The Hat every morning as I am getting ready for work. And he watches it. And I don't feel guilty at all.
Depends on the day and time of year. School days, she might get an hour to 90 minutes after school while I finish up work, but often she'll do crafts, read, or play video games on my phone or laptop because she wants to be upstairs with me instead of downstairs in the TV room. Then we do the whole evening routine and if there's time, she might get another half-hour right before bed/storytime. In the summer she gets more TV because the routine is more relaxed and there's no homework.
Oh, and I forgot to add that she gets more TV on weekends, too. I always take her with me for whatever errands I need to run and we go to swim class, but apart from that, she'll watch TV while I'm cleaning and doing laundry and household stuff.
Some days DS2 (almost) won't watch any tv. It may be on, but only certain shows catch his attention, we also put it on the kids music channel as background noise. Other days, he may ask to watch Mickey Mouse, so I will put an episode on. So on average, I would say he may watch an hour of tv several days a week.
Our TV is on all the time, but generally DS6 is coloring, or playing with something, or just following me around driving me crazy, so I'm guessing that he probably actually watches about an hour or so on weekdays and 2-3 hours on weekends...I've been trying to break the habit of constantly having the TV by turning it off and suggesting different activities for him to do, but some days this mama is just too tired! Honestly though, he's smart, very articulate, and creative so I don't worry about it too much...