Hermann Ebbinghaus in 1885 discovered memory loss is rapid and huge within the first few days of learning. But, it gets better after that. Ebbinghaus also discovered another phenomenon called overlearning during his study on forgetting curve. The basic idea is that if you practiced something more than what is usually required to memorize it, the effect of overlearning takes place. This means that the information is now stored much more strongly and thus the effects of forgetting curve for overlearned information is shallower.