Whilst this is a difficult question to put an exact figure on and will depend on various circumstances, masonry is one of the most durable components of a building therefore concrete bricks have a potential lifespan in excess of 100 years. Modern concrete manufacturing methods and the use of high quality cement, aggregates and pigments provides concrete bricks with excellent frost resistance and durability. They also benefit from the fact that they increase in strength as they age. Therefore, provided they have been designed and constructed in the correct way and used in the appropriate location they should be suitable for their intended use.