A reliability metric suitable for longer periods of time but not useful for daily or weekly reporting is?

Mean Time Between Failure (MTBF) is indeed a reliability metric that is particularly suitable for assessing the performance of equipment or systems over extended periods, often used in contexts where measuring performance over longer intervals is critical. MTBF effectively provides an average duration of operation between failures, making it valuable for long-term reliability analysis.

This metric is less practical for daily or weekly reporting because it aggregates data over a longer period to identify trends and patterns, which may not reflect immediate performance issues. For shorter reporting cycles, metrics that report on day-to-day operations or more immediate repair or maintenance metrics would be more useful.

In contrast, other options such as Overall Quality Rate or Reliability Rate typically involve immediate performance assessments that can fluctuate based on short-term variations, making them better suited for daily or weekly observations. Mean Time to Repair (MTTR) focuses on the duration of repairs rather than the time between failures, which emphasizes immediate operational response rather than long-term reliability trends. Thus, MTBF is the metric aligned with longer-term reliability evaluations.