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Re:The Cornell Note-taking System (2001) by jimhefferon on Tuesday December 03, 2019 @12:05PM (#21694167)
I think that 3x is a pretty standard recommentation. For instace, a quick google gave a first link (from cliffnotes.com) that says this.

Here's a guideline to what freshman can expect throughout their college years: Each unit of credit requires 2 to 3 hours of outside classwork per week. So, a student carrying 15 credit hours should plan to spend 30 to 45 hours each week studying beyond the classroom.

Re:The Cornell Note-taking System (2001) by chadlavi on Tuesday December 03, 2019 @12:11PM (#21694230)
per week, but not per day.

If a student has 3-4 classes a day, they can't reasonably spend 9-12 hours working solely on digesting those lectures that day. They'll have homework at the very least, likely some ongoing projects, normal human activities -- not to mention that in the US they probably also have a part-time (or full time) job.

Re:The Cornell Note-taking System (2001) by jimhefferon on Tuesday December 03, 2019 @07:05PM (#21698288)
> per week, but not per day.

Maybe we are talking about the same thing but maybe not. Most recommendations that I see (including the official one from the college where I work) say 2-3 hours outside class for every hour inside class. Maybe not the same day, but if you have a week with 3 hourly classes then the recommendation calls for 6-9 additional hours spent that week digesting the material of those class hours.