The term 'very long time' can be expressed in many ways, as evidenced by the crossword solutions given. EON (3 letters) is a geological period of time lasting millions of years. AEON (4 letters) is another word for an EON, and YEARS (5 letters) is a unit of time lasting 365 days. AGES (4 letters) is a long period of time, YONKS (5 letters) is a British slang term for a long time, EONS (4 letters) is another word for an EON, AEONS (5 letters) is another word for an EON, DECADES (7 letters) is a period of 10 years, DOGSAGE (7 letters) is a humorous term for a long time, BLUEMOON (8 letters) is a figurative term for a very long time, and AGESANDAGES (11 letters) is a phrase meaning a very long time.