The number of days the police travel is not fixed, which may depend on the needs of the task. Under normal circumstances, it is common to travel 1 to 3 days, but if the purpose of the business trip is more important and the task is heavier, the time may be longer. The length of travel time may also be influenced by human and material factors. The length of business trip depends more on the nature of the task and the complexity of the problem to be solved.