The Nielsen people record actual minutes using various "sites" across 180,000+ US-homes. Second Life comes out at 760 minutes per week (that's over 12 hours), or over 1h 45 minutes per day... (wimps - I'd be an outlier around the 2500 minutes per week mark!). Amongst its users (comparing to other user-minutes per week) this makes it more popular than even the 800lb gorilla of World of Warcraft (653 minutes per week).
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