Japanese Internet users spend more at-home time online than users in any other country: 13.9 days a month, compared to the overall average of 12.1 days a month. That’s one of the findings of the Media Metrix (www.mediametrix.com) Multi-Country Report for August, the most recent report available as of early November. Media Metrix looked at users in Australia, Canada, France, Germany, Japan, the U.K., and the U.S.