The Economist has reported (May 2010) that, in the UK, 90% of TV viewing is live TV viewing. Only after the viewer has found that there is nothing worth watching on live TV does he switch to anything he may have recorded on his Personal Video Recorder (PVR). This makes up just 7% of viewing. Only after seeing that he has nothing to watch on his live TV and pre-recorded TV does the viewer switch to video on demand services such as BBC iPlayer etc. This makes up just 3% of viewing.
The percentages may have changed since this Special Report with the growth in BBC iPlayer and other broadband delivery services but probably not by much. Connecting televisions to the internet is getting easier with Samsung SMART TV and new Sony Bravia sets automatically locating WiFi connectivity in the home. But people buy new televisions infrequently and televisions which automatically configure themselves to connect to the internet tend to be expensive sets which sell in low volumes.
In British homes with a Sky+ box, which allows for easy recording of programmes, almost 85% of television shows are viewed at the time the broadcasters see fit to air them. Some 60% of all shows recorded on Sky+ boxes are viewed within a day. Often the delay is only a few minutes—just enough to finish the washing up or to make a phone call.
The Economist Special Report also showed that on average people greatly underestimate the amount of television that they watch per day and greatly overestimate the amount of pre-recorded and internet video that they watch. On average in the UK everyone watches in excess of four hours television per day - in the US this is more like five hours television per day.
There is a short 2010 video from The Economist on this topic available from the link below.