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Old 04-27-2015, 02:24 AM
BarryB BarryB is offline Durations are not correct Windows 7 64bit Durations are not correct Office 2013
Durations are not correct
Join Date: Apr 2015
Posts: 19
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Default Durations are not correct

Hi all,

Being the novice that I am I've encountered another problem with a plan I am working on. Apologies in advance if this is something which has been discussed before.

I have developed a high-level plan which provides a broad overview of various projects and work scopes underway across the company. Within the plan I had set up an additional calendar to cover onsite working (based 12hr/6 day shifts per week as opposed to the 8hr/5 day shift on standard calendar).

However, I have just noticed that although my date range for individual tasks is correct the durations are not.

Now, what I understand (I think) is this is to do with the way MS Project calculates durations based on the information contained in the Project Options/ Scheduling settings/ Calendar Options. So, when I set a 12hr calendar across a 6 day week to some tasks and then set a specific window within which a task must be completed (22nd June 2015 to 24th July) and apply this new calendar, MS Project uses the date range I have entered but calculates the duration based around a standard shift?

Is this correct? If so, how can I resolve it?

The high-level plan gives a skewed impression that we will be working onsite for 43 days (based on the total number of hours worked divided by the standard 8hr?), when actual fact it is only 29 working days.

I apologies in advance as I imagine this has been asked before. Any help would be appreciated

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Old 04-27-2015, 03:59 PM
JulieS JulieS is offline Durations are not correct Windows 7 64bit Durations are not correct Office 2013
Join Date: Dec 2011
Location: New England
Posts: 1,693
JulieS will become famous soon enough

You are correct. You can only set one defintion of "hours per day", "hours per week", and "days per month." So when you enter a task duration of 10 days, Project translates that to 80 working hours (assuming 8 hours per day). It will schedule the task based upon the working time in the calendar that is controlling that task.

The attached picture shows you the impact of the task calendar with a 12 hour per day, 6 days per week.

If you are going to have many circumstances where you are going to have different calendars (different hours per day) - you need to likely stop talking duration. Talk start dates, finish dates and work.
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