Planned hours and a crew size must be specified for IWPs when you calculate duration.
Calculate duration from an IWP
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Open the Schedule window of an IWP.
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Click Calculate duration .
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On the Calculate Duration dialog box, type a value in the Hours worked per day box.
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Select Ignore non-working days to treat non-working days as regular work days when calculating duration.
When you specify non-working days, you can choose to ignore them, so the non-working day would be considered a work day. If you include them, work does not occur on a non-working day.
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Click Calculate to calculate the duration and update the Planned Finish date for IWPs selected in the Calculate Duration column.
If a Planned Start date is not defined, the Planned Start date is set to the current date. The Planned Finish date is calculated as the Planned Start date + duration.
Calculate duration from the Work Package Schedule window
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Click Work Package Schedule on the project home page to open the Work Package Schedule window.
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On the Work Package Schedule window, select a check box in the Calculate Duration column next to one or more IWPs on which you want to calculate duration.
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Select an IWP from the Work Package Schedule window to display the Actions menu .
Press CTRL or Shift, then select one or more IWPs in the Work Package Schedule window. You can also press CTRL + A to select all IWPs.
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Click Actions > Calculate duration to open the Calculate Duration dialog box.
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On the Calculate Duration dialog box, type a value in the Hours worked per day box.
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Select Ignore non-working days to treat non-working days as regular work days when calculating duration.
When you specify non-working days, you can choose to ignore them, so the non-working day would be considered a work day. If you include them, work does not occur on a non-working day.
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Click Calculate to calculate the duration and update the Planned Finish date for IWPs selected in the Calculate Duration column.
Click the Actual/Planned toggle key to change between Planned and Actual dates on the Work Package Schedule window. Planned dates display in blue, and Actual dates display in green. When you select Planned, the Work Package Schedule window displays Planned dates for each IWP. If no planned dates are set, the window displays any Actual dates that are set. When you select Actual, the Work Package Schedule window displays Actual dates for each IWP. If no actual dates are set, the window displays any Planned dates that are set. If Planned and Actual dates are not set, the Work Package Schedule window displays start date as today's date and finish date as next day's date.
If no Planned Start date is set, Calculate Duration check box is not displayed and the Calculate Duration option in Actions menu is disabled. If Actual Finish date is set, Calculate Duration check box is not displayed and the Calculate Duration option in Actions menu is disabled.