Fund trading needs at least one trading day. Investors are generally advised to hold the fund for more than 7 days before selling it. The fund redemption fee is determined according to the length of time the fund is held. If the fund is held within 7 days, the redemption fee is more expensive.
Funds bought on a trading day need to confirm the fund share on the second trading day. After the fund confirms the share, the fund can sell it at will.