There’s an index of “percent of leisure time spent on the web” and for students in the UK it’s 39%, the unemployed 32% and housewives 47%. This from the “Digital World, Digital Life” report by TNS (completed in June 2008, issued in press release form on 18th December 2008 and reported by The Guardian today)
The survey took the views of 27,522 people into account, from around the world, so seems robust. As a profile of online humans it’s fine but it’s not a profile of all humans because it was completed online.
Here’s the TNS summary: TNS completed analysis of the results of its 16-country study into online behaviour and perspectives around the world in June 2008. A total of 27,522 people aged 18 to 55 years old were interviewed online in the following countries: Australia, Canada, China, Denmark, Finland, France, Germany, Italy, Japan, Korea, Netherlands, Norway, Spain, Sweden, the United Kingdom and the United States. 2,500 were surveyed in the UK.