The term 'interminably long time' can be summarized by the word 'EON', which is a three-letter word. An EON is an extremely long period of time, usually referring to a span of millions or billions of years. It is often used to describe geological time periods, such as the Precambrian EON, which lasted from 4.6 billion years ago to 541 million years ago. In other contexts, it can refer to any very long period of time, such as an interminably long time.