An observed duration of 20 hours for a well drilling activity, an estimated lag of 5 minutes between two process steps, a calculated elapsed time of 3 days for a maintenance campaign.
'temporal datum' is the temporal counterpart of 'quality datum'. Where a 'quality datum' quantifies a 'quality' of an object, a 'temporal datum' quantifies a 'temporal region' associated with an activity. Multiple temporal datums may be assigned to the same temporal region, for example representing observed, estimated, and calculated duration values.
