Duration is the amount of working time required for a task. There are two types of durations in a project: task durations and resource durations.
A task duration is the amount of working time the task as a whole will take. You supply this information yourself, based on your knowledge of the situation and experience with similar tasks.
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A resource duration is the amount of working time a resource will spend on the task.
MacProject II determines resource duration, based on information you provide about the resource: the total units of work needed to complete the resource’s part of the task, the quantity of the resource, and the percentage of the resource’s available time that will be spent on the task (as specified by its calendar).