Mike, Also look at your defaults in the File > Options. These are options that project uses to convert daily/weekly/monthly duration entries into hours estimates. In the options window, you enter a default hours per day and default days per month. So for example, you’ll enter 8 hours in a day. Then, if you enter a duration value as 2D (days), Project uses this option to convert that into an hours estimate and you end up with a 16 hour estimate, regardless of the resource calendar availability.