In Structure.Gantt, duration for each task can be calculated in one of four ways:
By default, task durations are calculated automatically, based on each task's work estimate, the calendar, resource availability and the Work Estimates settings.
To adjust the duration of these tasks:
- Edit the task's work estimate fields, or
- Drag the left or right side of the task bar.
Dragging the right side of a task bar will cause the task's work to be updated and its duration to be recalculated.
Based on Start and Finish Dates
When tasks are manually scheduled and have both a manual Start and Finish Date, the task has a fixed duration, spanning the time between its Start Date and Finish Date.
To adjust the duration of a fixed duration task, drag either side of the task bar. This will update the task's Start or Finish Date, and the duration will be adjusted accordingly.
Based on Sprints
When tasks are scheduled based on sprints, they have a fixed duration corresponding to the length of the sprint. It is not possible to adjust the duration of these tasks, except by removing them from sprint-based scheduling or changing your sprint duration settings.
Manually Setting Fixed Duration
You can set a fixed duration for an individual task by updating the Fix. Duration field in the Task Details Panel.
Tasks can also be assigned a fixed duration based on a Jira field or formula, by assigning a Fixed Duration Attribute in the Gantt Configuration.