How long has Leshan Jinhaitang Hotel been monitored?

According to the "Measures for the Administration of Public Safety Video Image Information System", "the information of public safety video image information system shall be kept for at least 30 days; If laws, regulations, national standards and industry standards have other provisions on the shelf life, those provisions shall prevail. " The surveillance video of some special occasions needs to be kept for a long time, which will be kept for 3 months, half a year or even longer.