This is the amount of time, in hours, that you estimate the task will require to complete. It is okay if the exact amount of time is not known, but it should be as accurate as possible.

This number is used in the Task view to estimate your total work for the day. Looking above the task grid you will see two boxes, one with the total number of tasks for the day, and one for the total amount of time necessary to complete all of the tasks. The boxes will be color-coded to indicate the relative difficulty of completing all of the tasks on time.

Because this field is not required, the estimated time to complete all tasks will show a "+" at the end of the time to indicate that they are tasks with no estimated time (effectively zero).