In the long run, the sooner the fixed investment starts, the better. The advantage of fixed investment of the fund is that it does not need accurate market forecast, and it takes a long investment cycle to complete a round of smile curve, thus obtaining a higher return on investment.

Fixed investment is suitable for fund varieties with large net value fluctuation, such as stock funds, hybrid funds and index funds, while bond funds have relatively small net value fluctuation. Therefore, bond funds are not the best choice for fixed investment. Of course, if the risk tolerance is low and the investment style is conservative, it is also appropriate to invest in bond funds.

There are weekly, biweekly and monthly deduction cycles for fixed fund investment. There is no such thing as a fixed investment every day, and it is not necessary.

Generally speaking, three to five years is more appropriate. Of course, every investor's judgment and expectation are different. How long to invest depends on his expected income target and the market situation during the period.