Endless time is a concept that refers to an infinite amount of time, without beginning or end. The term ENDLESS TIME can be represented by three different words: EON (3 letters), ETERNITY (8 letters), and INFINITY (8 letters). EON is a very long period of time, usually referring to the age of the Earth or the universe. ETERNITY is an infinite amount of time, often used to refer to the afterlife. INFINITY is also an infinite amount of time, but it is more often used to describe something that is boundless or limitless.