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Time period that is taken as a basis for the design of the infrastructure, during which the optimum situation between the maximum durability and functioning is achieved, and the minimum cost, including the construction, exploitation and maintenance costs; all this in a way that the anticipated level of service provided is maintained.
- In construction: it varies between 20 and 50 years, its value being for:
*Road surfaces and pavements: flexible 20 years, concrete 30 years.
*Hydraulic works: 30 to 50 years.
*Structures: 30 years.
- In industry: it varies from 5 years (vehicles) and 15 years (industrial equipment).
