Possibly the most beneficial feature of the awnings are the fact that the have a usable life of well over 40 years.

Waste: the sun can affect the tubes used for drip irrigation, shortening their usable life.

Many experiments are conducted at or near 0 C to prolong the usable life of the muscle.

It also reduces the usable life of the Flash thus produced.

The torpedo is, however, coming to the end of its usable life as the batteries have expired in many of the torpedoes.

The tritium illumination has a usable life of 10-15 years.

Durable goods, goods with a long usable life in economics.

Sun is counting on its argument that the box has twice the usable life of any competing machine to forestall order erosion.

Amid these cathedral trees of 99 percent usable, man-centered life, he walked with a slow shuffle, hoarding his energy.

Add $100 a year for the Internet connection and the service contract and assume the computer has a usable life of two years.