Students spend average of 13-14 hours/week on homework
The National Survey of Student Engagement (in the US) has found that students spend an average of 13-14 hours per week on homework, which is far less than the 25 hours per week that college professors say is required for achievement.
In Canada, the Pan-Canadian Study of First Year College Students (Aug 2007) reported that 75% of students spent less than 15 hours per week studying.
Quoted from:
Mark Bauerlaein article in the Chronicle of Higher Education
