The term 'BIG STRETCH' can be broken down into several crossword solutions, including EON (3 letters), AEON (4 letters), ERA (3 letters), DECADE (6 letters), MONTHS (6 letters), EXPANSE (7 letters), and MILLENNIA (9 letters). EON and AEON refer to a long period of time, usually millions of years. ERA is a period of time marked by a distinctive character or a new development. DECADE is a period of 10 years. MONTHS is a period of time that is 12 months long. EXPANSE is a large area or space. MILLENNIA is a period of 1000 years. Together, these words describe a very long period of time, which is what the term 'BIG STRETCH' implies.