Many factors go into estimating the life of a product.
What it is made from, how it is made and used are some of the aspects that affect component life.
Safety factors to make things durable, strong, or safe, can seem like a common sense thing to do to account for these things and ensure longevity but can that be said to be reliable?
And at what cost is that factor being assigned?
Interested? Read on…Journal-Vol1-No1.pdf