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Activities Spanning More Days than it should in a Primavera P6 Schedule

3 replies [Last post]
Tue, 2025-06-10 10:43
karim saadi
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Hi Dears After having created and updated a CPM schedule using Primavera P6 you notice that some 1 day activities are spanning 2 days. How could this be possible? Although you are scheduling your schedule in days Primavera behind the scenes actually utilizes the hour and minute functions of a day within the program to perform the forward and backward passes. If you look a 1 day activity you may find that a 1 day duration activity actually spanning 2 days. It shows planning to start on 1 day but is forecasted to finish on the next when it should start AND finish all on the same day. SAADI.K
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Mon, 2025-07-07 01:31
#1
Emerald Associate...
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Tue, 2025-06-24 14:57
#2
Zoltan Palffy
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it has to do with times tunr on your times go to edit uses preference and turn on the times. 

also in there set the duration dispaly to 2 decimals as you may have soem activites that are not whole days.

any start milestones the TIME should be set to 8:00 am or the start of the day for the calendar that it is on.

any finish milestones the TIMES should be set to 5:00 PM or the latest time for at the end of the day for the calendar that this milestone is on.

also any start constraints the TIME should be set to 8:00 am or the start of the day for the calendar that this activity is on

also any finish constraints the TIMES should be set to 5:00 PM or the latest time for at the end of the day for the calendar that this activity is on.

also ALL actual start TIMES should be  set to 8:00 am or the start of the day for the calendar that this activity is on

also ALL actual fininsh TIMES should be set to 5:00 PM or the latest time for at the end of the day for the calendar that this activity is on.

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Sat, 2025-06-14 02:10
#3
Patrick Weaver
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The problem is almost always in the calendars - different number of hours in a day, different start times in a day, or simply a predecessor finishing half way through a day.  

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