What is the duration of the course?这门课程修完要多长时间？

I shall be away for the duration of the holiday.我整个假期都会外出度假。

He protected her for the duration of the trial.他在案件审理期间保护她。

of 10 weeks'/months'/years' duration为期10周/10个月/10年

Courses are of two years' duration.这些课程为期两年。

He was out of combat for the duration.他整个期间都无法参加战斗。