How good is our memory in term of learning?

We would on an average remember 20% of what we have learned yesterday. Thus to keep what we have learn in. Its important to have a revison of what we learn within 24hours again, follow by 1 week later and 1 month and lastly 3 mths. By then what we have learned should be ingrain in our 'hard disk'. And to keep what I have learn over the last weekend at Wealth Academy, I'll be logging  in my 'revision' daily onto the blog for future reference.