The term 'long runs' can refer to a variety of activities. The crossword solutions for this term are 'EONS' (4 letters), 'tenks' (5 letters), and 'MARATHONS' (9 letters). EONS are extremely long periods of time, usually measured in millions or billions of years. Tenks is a slang term for a 10 kilometer run, which is a common distance for running races. MARATHONS are long-distance running events that are typically 26.2 miles in length.