I have an issue in that I can put ina duration in whole dys and the calendar day length is extended by one dat almost all the time. I ensured the Working Hours are 8 hours per day, start at 0800 and end at 1700, 40 hrs per week ans 20 days per month. I have tried several combinations of hours per day and start stop times with no change in the discrepancy between duration days and calendar day periods.
Ken, are you using the same calendar for the project, tasks, and resources? Are you using the standard calendar and have you made any changes (besides day-off exceptions)?