Question

Unless we take steps to remember it, we forget much of the information we receive within ___________ hour(s) of seeing or hearing it.

Answer 1

the answer to this question is 24 hours.
On average, people only remember 10 - 20% information that we receive without conciously making an effort to remember it.
After 24 hours, the memory does not necessarily gone, but only stored in our subconcious level wouldn't be able to be retrieved in normal circumtances.