There is no specific time. Under the leverage of 150 times, when the subject matter purchased by investors rises by 1%, the yield of long investors reaches 100%, and the loss of short investors is 100%, that is, short positions appear; When the subject matter purchased by investors falls by 1%, short investors will gain 100% under the action of 150 times leverage, while long investors will lose 100%, that is, short positions. Therefore, when the leverage of futures is 150 times and the decline is 1%, (the increase is 1%), take long positions (short positions). Therefore, in the process of futures trading, investors should make rational use of their leverage, operate lightly, try to ensure that they have enough margin, and set up a stop-loss and profit-taking position after making orders.