Cats can be left in the trunk for about 1 to 4 hours. The specific time needs to be judged according to the actual situation. If it is a relatively hot summer, it is best not to exceed an hour, especially for young cats, otherwise they will easily become dehydrated or Death due to lack of oxygen; if the weather is relatively cool and the trunk is ventilated, it can be left for about four hours, but it is best to open the trunk every two hours to ventilate the cat.