The average Internet user in the United States spends three hours a day online, with much of that time devoted to work and more than half of it to communications, according to a survey conducted by a group of political scientists. ¶ The survey found that use of the Internet has displaced television watching and a range of other activities. Internet users watch television for one hour and 42 minutes a day, compared with the national average of two hours, said Norman H. Nie, director of the Stanford Institute for the Quantitative Study of Society, a research group that has been exploring the social consequences of the Internet. ¶ "People don't understand that time is hydraulic," he said, meaning that time spent on the Internet is time taken away from other activities. ...¶... Data collection was performed by Knowledge Networks, a survey research firm based in Menlo Park, Calif. The researchers plan to release the study on Monday on their Web site ... Link: The New York Times.