We have an application that gives us these fields in Excel. These are logged
jobs being performed for staff.

Start Date (date the job started)
StartTime
Returned Date (date job was completed)
Returned Time
Turnaround hours (total hours including non-working time)

If the job goes beyond the day it's started, I would like to create a
calculation to determine the numbers of hours a job took minus 16 hours of
non-working time for each day.

Thanks