My worksheet includes the ff:
E11: 0.0416666666666667 (in days) --> basically, this is 1 hour
F11: Start Date/Time (3/24/10 4:50PM)
G11: End Date/Time
What I would like to happen is to add E11 to F11 taking into account that it should only add working days and working hours (8:00AM to 5:00PM)...