If you watch all day, it's definitely too much. But that's true for lots of channels. For example, if I leave CNN (or any news channel run all day), the same stories, same facts or conjectures are on over and over.
Then there are days like today. I haven't turned by TV on since 2 in the morning - and I'd been asleep for a few hours by then. I'd been tuned into CNN's discussion of the plane disaster when I fell asleep and just flicked the set off and went back. So, I haven't seen the TSV even once yet and it's the middle of the afternoon.
Some days I think the whole world could be under siege and I wouldn't know it. That's scary. On the other hand, plenty of days, the TSV sells out and QVC is showing an OTO if I tune in and I suspect shoppers like me are one of the reasons they show items repeatedly throughout the day. They know some will be bored, but they also know there are going to be potential buyers at 4 or 5 in the afternoon, too.