Implementation Regulations for Supervising Civil Organizations at All Levels Article 20-1

If correction group really has difficulty in handling correction work, before the expiration of time limit for correction, it may explain the reason and apply to competent authority for extension of time limit for no more than three months, and such extension is limited to one time only.
中文原文 督導各級人民團體實施辦法第20-1條
整理小組辦理整理工作確有困難,得於限期整理期間屆至前,敘明理由向主管機關申請延長,其延長期間不得逾三個月,並以一次為限。

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