Expressing Time Duration: 2 years time OR 2 years' time

Author: Bob
Updated Date 28/07/2011 00:10:30
Number of views: 524

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Which option is correct?

a) 2 years time

b) 2 years' time

Bob - 28/07/2011 02:52:32

Correct Answer: b

We need to have the apostrophe