I currently live in an area that was once a Comcast service territory, and when Time Warner took over in this specific region back in '06, they waited at least few weeks until they pulled the plug, and finally after six years, they have it back.
However, the NFL Network addition didn't come without some sort of issue. NFLN was added to our area's lineup on Saturday, but, at least on my reciever, the audio came and went after three seconds, but there was no picture at all. I called TWC about this issue, and they did everything they could to fix the channel. Around 3pm my time, NFLN and its Redzone Channel finally appeared; the only game on locally at that time was the Pittsburgh-Oakland game on CBS (although most of the country got Houston @ Denver), and on Redzone, I could see parts of other games (Atlanta-San Diego, and Philadelphia-Arizona).