The main investment direction of money funds is bank time deposits and bonds. They all have a concept of remaining days. For time deposits, it is how many days before the deposit expires. For bonds, it is just how many days before this bond will repay the principal and interest.

The remaining days of the whole portfolio refers to the remaining days of each investment product in this fund, which is averaged according to the proportion of assets. For example, it has 1% time deposit with 3 days remaining, 2% bond A with 5 days remaining, and 7% bond B with 2 days remaining, and the remaining days of the portfolio are

1% * 3+2% * 5+7 * 2 = 3+1+14 = 27

. For example, if you deposit for one year, the interest will definitely be higher than if you deposit for three months. "The remaining days of the entire portfolio of the Monetary Fund cannot exceed 18 days" is mainly to prevent the Monetary Fund from desperately saving long-term deposits or buying long-term bonds simply for the pursuit of income, while ignoring the management of liquidity.