It has a useful lifetime of around three years, after which a fresh coat is recommended, but it depends on the present and local conditions.

Replies: The useful lifetime of nuclear weapons is not known.

Thus, Indowy ships have a useful lifetime in the thousands of years and virtually no maintenance.

The xanthone-treated product has an extended useful lifetime of ten years instead of three.

The useful lifetime of a new form or genre has never been so short.

The decision that opened the gate to a full and useful lifetime of firm decisions!

These batteries have a useful lifetime of about five years.

This may diminish their useful lifetimes as well.

Its system design tries to pay down those costs as quickly as possible, while maximizing the useful lifetime of the project.

Another application involves the breakdown in landfills after being strong during its useful lifetime.