Final answer:
An Order of Protective Custody is typically valid for 72 hours from its issuance to allow time for a medical evaluation and determine any further need for custody.
Step-by-step explanation:
An Order of Protective Custody (OPC) is legal action used to temporarily place an individual under protection, often in cases involving mental health concerns where a person is a threat to themselves or others. The duration an OPC is valid can vary depending on jurisdictions, but generally, the most common duration for an OPC is 72 hours from its issuance.
This is because this period is deemed sufficient for a medical evaluation and to determine the need for further treatment or prolonged custody, without unduly infringing on the individual's liberty. After 72 hours, additional legal proceedings are necessary to extend this period.