How long does the logistics train from Changsha to Chongqing take?

The logistics car from Changsha to Chongqing takes about 1 to 2 days. The distance from Changsha to Chongqing is about 500 kilometers. According to the calculation of freight express train speed of more than 40 kilometers per hour, the freight transportation from Changsha to Chongqing takes more than 12 hours. But the time does not include traffic jams and sudden traffic accidents. If there is an emergency, I can't get to Chongqing in those twelve hours.