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What is the difference of these two words?

For examle:

1.It was a difficult period in his life.

2.It was a difficult duration.

Are these two sentences above correct?

Any help would be appreciated !

Thanks !
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jason_steven1.It was a difficult period in his life.

2.It was a difficult duration.
A period is all the time from one point in time to another point in time; it is a span of time.

Duration is the measurement of time; it's the length of time; "one minute" is a duration; "three years" is a duration.

Every period of time has a duration. You can say "a period of one minute", "a period of three years", or any similar expression if you want to specify the duration of a period of time.

CJ
Comments  
Hi,CJ,thanks for so quick reply.

Is that 'a duration of one minute' or 'a period of one minute'?

Thank you very much!