But how long do we want them to last?
For cars, perhaps at least 30 years, or at least 200,000 miles.
For phones, at least 4 years.
For laptops, at least 6 years.
For digital cameras, at least 3 years.
For films, great films will be good for 50 years.
For philosophers, at least 100 years is sufficient.
For human life, at least 70 years is sufficient (according to Nietzsche). I would prefer 120 years, but 92 years will also do (when my grandfather passed).