I had a day off last week with the whole house to myself and ended up on the couch using my iPad for about 5 straight hours. In that time, I watched two shows I had downloaded from iTunes, streamed a 45 minute podcast over wi-fi, read a LOT of news, surfed a little bit, etc. When all was said and done, I had over 50% battery, and even after doing some reading on it that same night, I was still well above 50%.
So, I find it a struggle to wear down an entire iPad charge in one day. You would have to be actively using it for most of the day.