The report by the European Interactive Advertising Association also revealed a quarter of those surveyed spent more than 16 hours a week surfing the web.
Only France came above the UK in the survey, with an average of 13 hours spent online and 32% above the 16-hour mark.
Overall, Europeans spend around 10 hours a week on the internet, compared to 8 hours and 45 minutes in 2004, which is an increase of 17%.
Michael Kleindl, chairman of the EIAA and managing partner of Valkiria Network, said: "What is striking about this study is how quickly consumers are becoming such sophisticated internet users.
"It just goes to show that if you offer excellent content and services, the demand will be there.
"This is an important point for marketers to note as the internet is unlike any other media in terms of the sophistication of interaction is offers with consumers."
The EIAA, with the help of SPA and Synovate, interviewed 7,000 people across Europe for its latest piece of research.
Nigel Morris, chief executive of Isobar Worldwide, said: "Just in case there is still anyone out there that doubts it, this study is yet more evidence showing the effectiveness of the internet as a channel for reaching and connecting with consumers."
Mark Chippendale, regional vice president of media sales for Yahoo! Europe, said the portal had seen its average user spending 52 miniues just on Yahoo! sites alone each month.
He added: "Significant growth in online's share in terms of 'media mind' over the past year can be largely attributed to the increasing penetration of broadband.
"This has driven the popularity of and demand for sophisticated services and applications including rich content, digital music, search and instant messaging services.
"The skillsets and the mindsets of the online consumer are maturing and becoming more sophisticated - and the advertising community needs to work hard to catch up."
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