Hello, the answers to the above questions are as follows: the general answer to the number of days of criminal detention is this: three days at first, and then it can be extended to seven days, and under special circumstances it can be extended to thirty days. For example, if the object is a person's case, the maximum period of criminal detention is seven days, and after seven days, it will be transferred to arrest (if there is no evidence to prove it, it will be transferred to bail pending trial). If more than one person is suspected of committing a crime or is at large, the maximum period of criminal detention can be extended to 30 days. It is also common to be arrested after the expiration of 30 days (if there is no evidence to prove it, bail pending trial or release from criminal detention). It is also common to be released early or released on bail pending trial during criminal detention, depending on the specific situation. Public security detention is an administrative punishment, which is punished according to the Law of People's Republic of China (PRC) on Public Security Administration Punishment, and the specific detention period is clearly stipulated in the law.

Legal objectivity:

Article 85 of the Criminal Procedure Law: When a public security organ detains a person, it must produce a detention permit. After detention, the detained person shall be immediately sent to the detention center for custody, and shall not exceed twenty-four hours. Unless it is impossible to notify or the notification of suspected crimes endangering national security or terrorist activities may hinder the investigation, the family members of the detained person shall be notified within 24 hours after detention. After the circumstances that hinder the investigation disappear, the family members of the detained person shall be notified immediately.