"Long dozens" refers to a quantity of 12 items arranged in a linear or elongated manner. Synonyms for this phrase include "a dozen long," "a dozen stretched out," "a dozen extended," or "a dozen elongated." Other possible ways of expressing the same concept might be "a dozen in a row," "a dozen in sequence," "a dozen aligned," or "a dozen arranged end-to-end." Depending on the context in which the phrase is used, different synonyms may be more appropriate. However, all of these options convey the idea of a group of items that is both numerous and configured in a particular way.