planned lifetime
The length of time that an object is designed to last, as of the end of the design phase.
The planned lifetime of a structure or other object is the amount of time it is expected to remain in its completed state as of the time when its design is finished. Structures with a planned lifetime of less than 10 years are generally regarded as temporary structures. If the object lasts longer or shorter than expected, this field remains unchanged, because it is intended to reflect the designed lifetime rather than the actual lifetime.
The expectation is fixed at completion of the design phase. Years already spent in service do not reduce this original planned duration.
Actual survival beyond the plan, or demolition before its expected end, concerns the object's observed history. Neither event changes the lifetime that the completed design originally anticipated.
Related definitions
-
escalator ride time (max)
The ride time from beginning to end of the longest escalator in a structure. -
journey duration
The time needed to ride a complete track or defined course from its beginning to its end. -
non-stop elevator ride time
The uninterrupted bottom-to-top ride time in an elevator, using the minimum journey time in the longest elevator for a whole building. -
retractable roof opening time
The minimum time needed for a mechanically retractable roof to move from fully closed to fully open. -
rotation time
The amount of time in which a moving part of a structure rotates or revolves at maximum speed.