1. At room temperature. Generally, it is no problem to eat within 2 hours. After more than 2 hours, the activity of many pathogenic microorganisms will be enhanced, and toxins will also be produced, which will easily lead to poisoning or gastrointestinal discomfort.
2. In the frozen state. If crabs are put into the frozen layer of refrigerator immediately, the activity of pathogenic microorganisms will be inhibited and the preservation time will be extended to 3~7 days. However, it is recommended to eat within 1~2 days, and the nutritional value will be reduced if the time is too long.