How many hours do adults spend watching tv?

Studies in the early part of 2010 came up with two figures:

UK adults watch on average 4 hours of television per day, amounting to 120 hours each month.

US adults are reported to watch rather more television, at an average of 150 hours each month. That works out to 5 hours of television per day.

As these are averages, it indicates that while many people watch far less than that amount, there are others who watch considerably more. Although the question does not ask if adults watch an unhealthy amount of television, the figures suggest that there may be people who watch television as their sole means of entertainment to the exclusion of almost everything else.