According to time-use surveys analyzed by professors Philip Babcock, at the University of California Santa Barbara, and Mindy Marks, at the University of California Riverside, the average student at a four-year college in 1961 studied about 24 hours a week. Today’s average student hits the books for just 14 hours.
The problem seems to predate computers and the Internet:
Between 1961 and 1981, study times fell from 24.4 to 16.8 hours per week (and then, ultimately, to 14).