Answer: In order to avoid delays caused by irresistible factors such as typhoons and ship faults, it is necessary to ensure that there is sufficient clearance time after the exhibits arrive at the destination country; at the same time, the customs of the destination country may open the box for inspection after the exhibits arrive at the destination port; if the city is not the destination city, inland transportation of the exhibits should be arranged. Therefore, the arrival time of exhibits is usually 15 to 30 working days before the exhibition is launched.