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Correct Interpretation of Man Days.

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Let say if the project require 50 man-days. Can we allocates resources as below:

a) 5 man x 10 days=50 man days

b) 1 man x 50 days=50 man days

c) 50 man x 1 day = 50 man days.

Is it all are equivalents
asked 6 years ago by hairul (1,320 points)

1 Answer

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Yes, these are all equivalent.  Most important however is that the concept needs to be man hours and not man days.  A man hour is the amount of work an average person can perform in an hour without a break.  

A man day is a bit nebulous as people cannot work 24 hours.  Large projects do use man days and man years.  A man day then needs to have some understanding of how many hours per day as assumed.

A man year is even more nebulous and rooted in culture and custom.  Reported highs and lows for hours worked per year vary from about 1,400 to 2,400.
answered 6 years ago by sdcapmp (45,840 points)

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