Final answer:
Interim Authority to Test (IATTs) are granted for temporary testing in real-world scenarios, typically for less than 90 days. They are used to assess systems' operational performance with live data or in an operational environment, under controlled terms that require reassessment upon expiration or completion of testing.
Step-by-step explanation:
The question pertains to Interim Authority to Test (IATTs), which are temporary authorizations granted for the purpose of testing systems in a specific operational environment or with live data. These authorizations are crucial in ensuring that systems operate as intended in real-world scenarios. The timeframe for which an IATT is usually granted can vary depending on the specifics of the test objectives and the constraints of the operational environment.
The hint provided with the question suggests that we look at two scenarios to find an equivalent answer: a system that operates only for 12 hours or one that runs at half-power for 24 hours. This implies a consideration of the operating time or intensity as factors in determining the appropriate duration for test authorization.
However, based on standard practices, IATTs are commonly granted for short-term periods. This duration is typically less than 90 days, after which they either expire or require re-authorization depending on the test outcomes and further requirements. The short duration reflects the temporary nature of the authorization and the need to reassess the system's performance and security in a controlled manner.