Labor Union Act Article 36

In case that it is necessary for the directors or supervisors of a labor union to process union affairs during their working hours, the labor union may reach an agreement with their employer to provide them with a certain number of hours as official leave.In case that a corporate union and the employer do not reach such an agreement as prescribed in the preceding Paragraph, its chairperson of the board of directors may be entitled to have an official leave for half a day or a whole day, and other directors or supervisors may have an official leave for up to fifty hours per month to process union affairs.In case that a director or supervisor of a corporate union assumes the chairperson of board of directors of a national confederated labor union and the corporate union does not reach such an agreement as prescribed in Paragraph 1 to the article, the director or supervisor may have an official leave for half a day or a whole day to process union affairs.
中文原文 工會法第36條
工會之理事、監事於工作時間內有辦理會務之必要者,工會得與雇主約定,由雇主給予一定時數之公假。
企業工會與雇主間無前項之約定者,其理事長得以半日或全日,其他理事或監事得於每月五十小時之範圍內,請公假辦理會務。
企業工會理事、監事擔任全國性工會聯合組織理事長,其與雇主無第一項之約定者,得以半日或全日請公假辦理會務。

English translation for reference only; the Chinese text prevails. Not legal advice.