[EdwardCoffin]

Was it in The Future of Reading [1] perhaps? From page 6:

In a very different approach, most music and sports learning only has contact with a one on one expert once or twice a week, lots of individual practice, group experiences where “playing” is done, and many years of effort. This works because most learners really have difficulty absorb ing hours of expert instruction every week that may or may not fit their capacities, styles, or rhythms. They are generally much better off spending a few hours every day learning on their own and seeing the expert for assessment and advice and play a few times a week.

A few universities use a process like this for academics—sometimes called the “tutorial system”, they include Oxford and Cambridge Universities in the UK.

[1] http://www.vpri.org/pdf/future_of_reading.pdf