duration

/ˈdʊˈreɪʃən/

the period of time during which something continues

中文释义：持续时间；期间

The duration of the flight from London to Tokyo is approximately twelve hours.

从伦敦到东京的飞行持续时间大约为十二小时。

Students must complete the course within the specified duration to receive a certificate.

学生必须在规定期限内完成课程才能获得证书。