Deltek PM Compass uses the following duration units:
m — Months
w — Weeks
d — Days
h — Hours
t — Minutes*
*You do not have the ability to enter duration in minutes; however, there may be occasion when the system calculates the duration value and displays it in minutes.
While duration may contain decimal values (for example, 4.5 D), you cannot enter duration using mixed duration units. (For example, 4D4H is not allowed.) Open plan interprets an activity with a blank duration field as having zero duration.