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# MS Project 2013 auto schedule duration

I am a bit confused on how MS Project calculates the duration for the auto schedule for a summary task. Attached is the snapshot of my tasks. For the summary task, it summarizes as 20.38 days from 1/19 to 2/16. But the duration for all the tasks adds up to 16 hrs. I was expecting 2 days or 16 hrs for the duration for the summary task.
Capture.JPG
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leblanc
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2 Solutions

Commented:
DURATION is the measurement, in calendar units, between a start point and a completion point, but MSP (and most PM software) ignore non-work days when calculating duration.

So, if something starts January 19, and completes on February 16

Then "elapsed duration" is the days
19, 20, 21, 22, 23, 24, 25, 26, 27, 28 29, 30 , 31
+
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
+
3 hours

for "duration" remove Saturdays/Sundays and then
19, 20, 21, 22, 23,   26, 27, 28 29, 30
+
2, 3, 4, 5, 6,   9, 10, 11, 12, 13
+
3 hours
= 20.38 Days

For example, let's say we had  3 tasks, each takes 1 hour. They ALL can be conducted in parallel.

A summary of those tasks is  1 hour
|---------| summary

IF those tasks cannot be done in parallel then the summary duration is much larger:
``````|-----------------------------| summary
``````
You CANNOT simply add durations to arrive at the duration of a summary task, you MUST consider the span between start and end.
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