The opposite of "more long continued" would be "less prolonged," "shorter," or "brief." All these antonyms imply the opposite meaning of long-lasting, enduring, or extended. When we say something is "less prolonged," we mean it has a shorter duration or is not as persistent as something that is "more long continued." Similarly, the term "shorter" refers to something that lasts for a lower duration than expected. Lastly, "brief" means something that is concise, simple, and does not last long. In summary, these antonyms offer a vivid contrast to the idea of something being "more long continued.