Time Between Failure (TBF) is a metric used to measure the reliability of a system or component. It is defined as the amount of time that passes between the occurrence of two consecutive failures of a system or component. TBF is a useful measure of reliability because it allows organizations to track how long a system or component can be expected to operate without failure. TBF can be used to identify potential problems with a system or component before they occur, as well as to compare the reliability of different systems or components. Additionally, TBF can be used to identify areas of improvement in a system or component and to help organizations plan for future maintenance and upgrades. TBF is an important metric for organizations to track in order to ensure the reliability of their systems and components and to ensure the safety of their customers.