I flubbed this question mainly because I never selected a task type. The answer of course is all over the internet :-(, but the main thing to remember is that there is a formula: 1 day duration = 8 hours work/100% units. If you fix duration, work, or unit this formula needs to keep balance. The default if you enter a task in the task sheet is Fixed Units, but if you are in the Task Sheet and open the Task Information dialog box, all input boxes are blank.