You may trade beginning when the exchange trading opens for your particular asset. Generally this is 5pm CT but may differ based on holiday or asset.
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All positions and working orders must be closed by 3:50pm CT until 5pm CT.

GF/HE/LE must be closed by 1:05pm CT until 5pm CT.

XC/XK/ZC/ZL/ZM/ZS/ZW must be closed between 7:45am-8:30am CT and then again between 1:20pm-5pm CT.
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Trading can be conducted throughout the day except over public holidays and any times when the exchanges are closed.