Commodity Exchange: At the COMEX—a member of the CME Group—a standard copper futures contract represents 25,000 pounds of copper, while the mini-copper futures represents 12,500 pounds of copper. These contracts trade Sunday-Friday between 6:00 p.m. and 5:15 p.m. (CST). This means investors can make a play for approximately 23 hours every day (there is a 45-minute break period between each day).