Data Type Duration (duration field: A type of field whose content is expressed as a duration of time. Examples include the Work, Duration, and Delay fields. A duration field includes the duration unit, such as hour, day, or week.)
Entry Type Calculated (calculated field: A field in which the value is determined by Project based on information in other fields. Project may recalculate the value automatically or when you specify, depending on your choice of calculation settings.)
Description The Duration Variance field contains the difference between the baseline (baseline plan: The original project plans [up to 11 per project] used to track progress on a project. The baseline plan is a snapshot of your schedule at the time that you save the baseline and includes information about tasks, resources, and assignments.) duration of a task and the total duration (duration: The total span of active working time that is required to complete a task. This is generally the amount of working time from the start to finish of a task, as defined by the project and resource calendar.) (current estimate) of a task.
How Calculated The Duration Variance field contains "0 days" until the duration value varies from the baseline duration value, as shown in the Baseline Duration field. Project then calculates duration variance as follows:
Duration Variance = Duration - Baseline Duration
Best Uses Add the Duration Variance field to a task sheet when you want to analyze whether your schedule is taking more or less time than originally planned.
Example You set a baseline for your project three months ago, and you now want to review duration variances for the tasks. You add the Duration Variance field to the Task Sheet view to analyze the project's progress and performance to date.
Remarks If the duration variance is a negative number, the task is scheduled to take less time than originally planned. If the duration variance is a positive number, the task is scheduled to take more time than planned. If the duration variance is zero, the task is taking exactly as much time as originally planned.
The Duration Variance field contains "0 days" until the duration value varies from the baseline duration value, as shown in the Baseline Duration field. You can set a baseline in the Set Baseline dialog box. This copies the current value for the scheduled Duration field into the corresponding Baseline Duration field.
You can use the Tracking Gantt view to see the duration variance shown graphically with Gantt bars.