Legal analysis: The longest period of criminal detention for trademark infringement suspected of constituting a criminal offense is 37 days. If the public security organ deems it necessary to arrest a detained person, it shall submit the matter to the People's Procuratorate for review and approval within three days of detention. In special circumstances, the time for submission for review and approval may be extended by one to four days. For major suspects who commit crimes on the run, commit crimes multiple times, or commit crimes in groups, the time for review and approval can be extended to 30 days. The People's Procuratorate shall make a decision on approving or disapproving the arrest within seven days after receiving a request from the public security organ to approve the arrest. If the People's Procuratorate does not approve the arrest, the public security organ shall release the person immediately upon receiving the notice and promptly notify the People's Procuratorate of the execution status. For those who need to continue investigation and meet the conditions for release on bail pending trial or residential surveillance, they will be released on bail pending trial or placed under residential surveillance in accordance with the law.

Legal basis: Article 91 of the "Criminal Procedure Law of the People's Republic of China" If the public security organ believes that a detained person needs to be arrested, it shall file a request for arrest within three days after the detention. Reviewed and approved by the People's Procuratorate. In special circumstances, the time for submission for review and approval may be extended by one to four days.