Final answer:
The retention period for entry permits varies by jurisdiction and type of permit, with no universal standard. In U.S. immigration, related records are often kept in line with citizenship eligibility requirements, typically five years for Legal Permanent Residents.
Step-by-step explanation:
The question posed relates to the retention period of entry permits, which is a requirement within the legal and business framework, particularly in areas of compliance and human resources. The retention period for such documents is contingent upon the laws and regulations of a given jurisdiction. However, the specific duration for retaining entry permits is not universal and may change depending on the country or type of permit.
In the context of U.S. immigration law, related documents such as Legal Permanent Resident status records might be kept for different periods, often aligning with the time-frame that residents are expected to maintain their status before they're eligible to apply for citizenship - typically five years for most applicants.
However, since the question did not specify the type of entry permit, nor the jurisdiction, it is difficult to provide a definitive answer. Generally, businesses might retain such records for a minimum of one to several years based on the relevant legislation.