Test of time and meaning of duration

[Guest]

Test No. incompl/inter-59 "Testing, Testing", question 1

This castle has been here since the 16th century and hasn't really changed - it has stood the test of ..........

(a) duration
(b) time
(c) history
(d) length

Test No. incompl/inter-59 "Testing, Testing", answer 1

This castle has been here since the 16th century and hasn't really changed - it has stood the test of time.

Correct answer: (b) time

Your answer was: incorrect
This castle has been here since the 16th century and hasn't really changed - it has stood the test of duration.
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why not use duration

[Alan]

Duration is a specific length or period of time. In this sentence I am writing about time as an abstract idea and there is no limit to it.
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