The term 'LO-O-O-ONG TIME' can be represented by three different crossword solutions: EONS (4 letters), EON (3 letters), and AEON (4 letters). EONS, EON, and AEON all refer to an extremely long period of time. An EON is the longest division of geological time, lasting for millions or billions of years. It is divided into eras, which are further divided into periods, epochs, and ages. An EON is the largest unit of geological time and is used to describe the age of the Earth. An AEON is a similar concept, but it is used to describe a much longer period of time, such as the age of the universe.