The term 'quite a long time' can be expressed in four different ways using crossword solutions. The first is 'EONS' which is a very long period of time, usually measured in millions or billions of years. The second is 'AEON' which is another word for an EON, but it is also used to refer to an indefinite period of time. The third is 'EON' which is a unit of geological time that is equal to one million years. Finally, the fourth is 'AGES' which is a much longer period of time than a single human lifetime, often referring to a period of history. All of these words indicate a very long period of time, and together they express the phrase 'quite a long time'.