Slack time is the amount of time that a task can slip without delaying the rest of the project. It is extra time allowed for a task after the task’s planned or projected finish.
MacProject II displays slack time associated with tasks in the Task Timeline and Resource Timeline as a shaded extension to a bar (added on after the elapsed time).
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Slack time appears in the Project Table, and you can display it as one of the attributes in the Schedule Chart.
Resources can also have slack time associated with their assigned work on a task.