"Every perception is to some degree an act of creation, and every act of memory is to some degree an act of imagination."
-- Gerald Edelman, Second Nature: Brain Science and Human Knowledge
The early impact of the prototype mnemonic medium2 The early impact of the prototype mnemonic mediumThe early impact of the prototype mnemonic mediumHow can we develop transformative tools for thought？2020-10-18Journal
So, for instance, after 6 repetitions, we see from the graph that most users are up around 6,000 days of demonstrated retention. That means an average of about 6,000 / 112 ~ 54 days per question in the essay. Intuitively, that seems pretty good – if you're anything like us, a couple of months after reading something you have only a hazy memory. By contrast, these users have, at low time cost to themselves (of which more below), achieved nearly two months of demonstrated retention across 112 detailed questions.