Hotel monitoring can generally be kept for 31 days. According to the Law of the People's Republic of China on Public Security Administration Punishment, hotels should keep at least 31 days of surveillance video materials for public security organs to investigate and use. With the continuous development of technology, more and more hotels use digital surveillance video system, which can be used for remote monitoring and storage, and the storage capacity and time have also increased. Some large hotels can also set different storage times and storage areas according to their own needs and safety management regulations to ensure the safety and reliability of surveillance videos.