Open an account with a futures brokerage company and then save money for trading. Delivery means that after the contract expires, the spot price is set at the contract futures price, and you can choose to deliver goods or cash. The longest holding time is the expiration time of the contract you bought. For example, if you buy a contract in June, you should choose to clear the stock in the secondary market before the delivery date in June or deliver the spot or cash on the delivery date. Then you can hold it from now until that day. If you buy it in September, you can keep it until September. If it is 65438+February, it can be held until 65438+February. However, futures is a leveraged market. Before you decide to hold it for a long time, make sure that your account deposit is sufficient.