How long is the hotel check-in information kept for the whole season?

Keep it for 3 years. According to Article 15 of the Law of the People's Republic of China on Resident Identity Cards, when performing their duties according to law, the people's police can check their resident identity cards. Under any of the following circumstances, you can show your law enforcement certificates: (1) You need to identify yourself if you are suspected of committing a crime; (two) when implementing on-site control according to law, it is necessary to find out the identity of the relevant personnel; (3) It is necessary to find out the identity of the relevant personnel at the scene in case of an emergency that seriously endangers social order; (four) during major events in railway stations, long-distance bus stations, ports, docks, airports or places designated by the Municipal People's government, it is necessary to find out the identity of the relevant personnel; (five) other circumstances required by law. In any of the circumstances listed in the preceding paragraph, if the people's police refuse to examine the resident identity card, they shall take measures to deal with it in accordance with relevant laws and regulations. No organization or individual may detain a resident identity card. However, unless the public security organ executes the compulsory measures of residential surveillance in accordance with the Criminal Procedure Law of People's Republic of China (PRC). So keep it for at least 3 years for future reference.