Hong Kong stocks are T+0 transactions, and stocks bought (shorted) on the same day can be sold (buyback) on the same day.
After buying (short selling), investors find that they have made a mistake in judgment and can sell (buyback) in time to avoid risks and losses.
The Hong Kong stock settlement rules are T+2, that is, for stocks traded today (T0), the securities company and the clearinghouse will complete the settlement of funds and stocks on the second trading day (T+2).
For example, T0 is Monday, and settlement will be completed on Wednesday; T0 is Thursday, and settlement will be completed next Monday.
Note: The above times are all trading days.