耐たい用よう年ねん数すう

noun

service life; useful life

Technical term used in accounting, engineering, and asset management to indicate the expected period a machine or asset can be used.

• この機き械かいの耐たい用よう年ねん数すうは10年ねんです。

  The service life of this machine is 10 years.

• 耐たい用よう年ねん数すうを過すぎた設せつ備びは更こう新しんが必ひつ要ようだ。

  Equipment that has exceeded its useful life needs to be replaced.