The phrase "prescribed period" refers to a specific amount of time that is officially set or recommended for a particular purpose or action. Full definition
The adoption is finalized after the child has lived with the family for a legally prescribed period of time that varies by state, but is usually around 6 months. (creatingafamily.org)
The new policy is important given that new pension legislation will expressly require plan administrators to retain records for prescribed periods. (allaboutinformation.ca)
(9) The Lieutenant Governor in Council may make regulations prescribing a period of time for the purpose of subsection (8). (ontario.ca)