Constitution of the Republic of China (Taiwan) Article 68
The Legislative Yuan shall hold two sessions each year, and shall convene of its own accord. The first session shall last from February to the end of May, and the second session from September to the end of December. Whenever necessary, a session may be prolonged.
中文原文 中華民國憲法第68條
立法院會期，每年兩次，自行集會，第一次自二月至五月底，第二次自九月至十二月底，必要時得延長之。