The term 'It's Been a Long Time' can be summarized by the crossword solution EON, which is an abbreviation for an aeon, a unit of geological time. An aeon is a very long period of time, usually millions of years, and is used to describe the age of the Earth or other planets. The phrase 'It's Been a Long Time' is often used to express the feeling of having been apart from someone for a very long time.