My calculated completion date is wrong....not

Okay, I learned something today. I feel compelled to share it, so the Tech Support team doesn't get more questions like mine. I have been notorious for telling Tech Support the calculated completion date is wrong. I have learned that each time, WorkFront was calculating it correctly. Here are the reasons I learned why I think the calculated completion date is wrong, but really isn't: 1) The task was assigned to someone, and that someone has time off in that time period. In this case, WorkFront automagically extends the duration of the task by the number of days the person has off. 2) The task resource is assigned to a calendar that has exceptions in the time period I thought the task should run. WorkFront pushes the duration of the task out, since that resource won't be working those days; 3) The project is assigned to a calendar that has exceptions in the time period...same thing as number two above; 4) Here is the humbling factoid I learned today: There is a setting under Project Preferences, Approvals, Approval Settings. If a task is assigned to an approval workflow, you can pick how many days to automatically add to the task duration to account for the time it takes a task to get through the workflow. As it turns out, ours was set to five days. For tasks that had an approval workflow assigned, we couldn't figure out why every task was five days longer than expected. Well,. we know now. Does anyone know of any other thing that factors into the calculation of a completion date, aside from the obvious Task Constraints and Duration Types? Thanks! Eric