Units unable to meet requirements for secure storage must have immediate access not to exceed how many minutes?

The correct answer is 60 minutes. In the context of security requirements for storing certain materials, particularly in a military or maritime environment, having immediate access within a specified time frame is crucial for maintaining operational readiness and ensuring the safety of personnel and assets. The standard for units that cannot meet secure storage requirements is set to 60 minutes to provide a balance between safety and accessibility. This time frame allows for a swift response in case of emergencies or urgent operational needs, while still complying with broader security protocols designed to manage risks associated with potentially hazardous materials. Overall, the 60-minute guideline reflects an understanding of both the need for security and the requirement for flexibility in critical situations.