I've been searching the community posts and I haven't found anything to indicate the following is a feature, so this may belong in the product feedback category... In order to accurately track estimate to completion, it would be helpful when you mark a task as "completed," the "effort" field on that task will automatically update to match the total time logged against it essentially making the planned effort align with the actual time spent on the task once it's completed. Currently when calculating the ETC the remaining effort is factored in, which if there is time left after completing the task makes it appear that there is more time to be spent.