The duration of an event or state is the time during which it happens or exists.
He was given the task of protecting her for the duration of the trial.
他被委派在审判期间保护她的安全。
The result was an increase in the average duration of prison sentences.
结果是监狱服刑的平均期限的增加。
Courses are of two years' duration.
课程时长为两年。
for the duration
If you say that something will happen for the duration, you mean that it will happen for as long as a particular situation continues.
His wounds knocked him out of combat for the duration.
在整个战斗中,他的伤一直令他无法参战。