The term 'long times' can be described by four different crossword solutions: EONS (4 letters), aeons (5 letters), EPOCHS (6 letters), and ERAS (4 letters). EONS are the longest unit of geological time, typically lasting hundreds of millions of years. Aeons are even longer than EONS, and are used to describe the age of the universe. EPOCHS are shorter than EONS and aeons, and are used to describe a period of time in history or prehistory. ERAS are also shorter than EONS and aeons, and are used to describe a period of time in history or prehistory that is characterized by a particular set of events or developments.