According to Fage's inquiry, the extension period of the bank's wealth management subsidiary's business extension shall not exceed 3 months. Legal basis: Article 15 of the Measures for the Administration of Financial Subsidiaries of Commercial Banks stipulates that the preparation period of a financial subsidiary of a bank is six months from the date of approval. If the preparatory establishment is not completed on schedule, it shall submit an extended preparatory establishment report to the the State Council Banking Regulatory Authority 0 months before the expiration of the preparatory establishment period. The preparation shall not be postponed more than once, and the extension period shall not exceed 3 months.