I am using a 5 working days & 8 hours standard calendar. My task is 30 days . I have selected a start date on Monday and end date on Friday (30th work day) but the durationn reflects as 40 days instead of 30 days? How can I ensure that the duration reflects the correct work days for the task?
You should not be selecting start and end dates. Select the start date and duration, let project calculate the end date. Even better, don't select the start date and use predecessors to drive the date, just noting the duration.