Time on end is a phrase that is used to describe something that lasts for a very long period of time. The crossword solutions for this phrase are AEONS (5 letters), EON (3 letters), AEON (4 letters), and EONS (4 letters). AEONS and EONS are both plural forms of the word EON, which is defined as an indefinitely long period of time. AEON is a variant spelling of the same word. Therefore, all four of these words can be used to describe something that lasts for a very long period of time.