Actual Duration is the total time, measured in calendar units, between the actual start date of a scheduled activity and either the project’s data date (if the activity is in progress) or the actual finish date (if the activity is complete). It provides a real measure of how long an activity has taken compared to initial estimates.
Key Aspects of Actual Duration
- Reflects Real Execution Time – Measures the true time spent on an activity.
- Dynamic Measure – If an activity is ongoing, the actual duration is updated up to the current data date.
- Used for Performance Tracking – Compared against planned duration to assess schedule efficiency.
- Expressed in Calendar Units – Typically measured in days, weeks, or months.
Example Scenarios
Software Development Project
- Planned Duration for Feature Development: 10 days
- Actual Start Date: March 1
- Actual Finish Date: March 14
- Actual Duration: 14 days (delayed by 4 days)
Construction Project
- Planned Duration for Foundation Work: 20 days
- Actual Start Date: April 10
- Data Date (Current Status): April 25 (Work still in progress)
- Actual Duration: 15 days (as of April 25)
Why Actual Duration Matters
- Enhances Schedule Accuracy – Helps refine future project time estimates.
- Supports Performance Analysis – Used to compare planned vs. actual execution times.
- Aids in Delay Management – Identifies potential schedule risks early.
See also: Activity, Activity List.