New Cognitive Research Shows Gaining Knowledge and Achieving Mastery Come Down to the Rule of 7
From Inc. Magazine:
While talent matters, we all learn at basically the same rate. And we can learn anything we want.
The real difference tends to lie in initial knowledge. Yet with practice, any student can reach a "mastery level." How long does it take to master a particular knowledge component? Call it the Rule of Seven: on average, about seven sessions.
Read more here.