Criminal detention for fighting and minor injuries is generally three days, and then if the public security organ deems it necessary to arrest, it shall report to the people's procuratorate for examination and approval; Under special circumstances, it can be extended for one to four days; Major suspects who commit crimes on the run, commit crimes many times or commit crimes by gangs can be extended to 30 days.
Legal objectivity:
Criminal Procedure Law of the People's Republic of China
Article 91
If the public security organ deems it necessary to arrest the detained person, it shall submit it to the people's procuratorate for examination and approval within three days after detention. Under special circumstances, the approval time can be extended by one to four days. For major suspects who commit crimes on the run, commit crimes many times or commit crimes in collusion, the time for submitting for examination and approval may be extended to 30 days. The people's procuratorate shall, within seven days after receiving the approval letter from the public security organ, make a decision on whether to approve or disapprove the arrest. If the people's procuratorate does not approve the arrest, the public security organ shall immediately release it after receiving the notice and promptly notify the people's procuratorate to execute it. Those who need to continue the investigation and meet the conditions of obtaining a guarantor pending trial or residential surveillance shall be granted a guarantor pending trial or residential surveillance according to law.
Criminal Procedure Law of the People's Republic of China
Article 99
The people's court, the people's procuratorate or the public security organ shall release the criminal suspect or defendant after the expiration of compulsory measures, obtain bail pending trial, monitor residence or change compulsory measures according to law.