Final answer:
The cosignature of a telephone order by a doctor typically must occur within 24 to 48 hours, depending on healthcare facility policies and state or country regulatory requirements.
Step-by-step explanation:
The time frame within which a doctor must cosign a telephone order can vary based on the regulatory requirements of the state or country, and the policies of the specific healthcare facility where the order is being made. Although there is no universal answer, in many cases, regulations require cosignature within 24 to 48 hours.
It is important for healthcare providers to be familiar with their institution's policies and comply with them to ensure proper patient care and legal compliance.