The fund purchased by each bank is related to the agreement between fund companies. For example, when buying, it arrives on T+2, which means buying on T, but it arrives on T+2 (where T is the trading day, usually Monday to Friday).
When redeeming, it takes a long time for the funds to arrive in the account, generally T+4 days. Therefore, when purchasing and redeeming, you must read the relevant regulations clearly.