In terms of minutes, average usage for the Wii is 58 minutes per session, while the PS3 clocks in at 64 and the 360 at 78 minutes.
The report also collected data on last generation systems such as the original Xbox, the GameCube and the PS2, and says the Wii and GameCube show similar numbers.
"Predominant users of the Wii and GameCube are likely to use these consoles at most once a week and for fewer minutes and the fewest number of sessions compared to the other two groups of consoles," notes the report.
The survey collected data from 17,000 US households.
You can view the PDF here.