The estimated length of time befor the system will have to be replaced or rehabilitated.
The design life of the pavement. The amount of traffic influences the design life.
The period of time for which a facility is expected to perform its intended function.
The projected lifetime of a power supply during which it will run at its stated specifications.
The length of time a product or system is expected to perform for in accordance with the technical specification to which it was produced.
Period of time a system or appliance (or component of) is expected to function at its nominal or design capacity without major repair.
The design life of a component or product is the period of time during which the item is expected by its designers to work within its specified parameters; in other words, the life expectancy of the item.