In excel I want to track line efficiencies based on time. I need to know how
to subtract 1 time from another. I do not appear to have any trouble with
adding times.

Cell A1 Cell B1 Cell c1
Start Time End Time Hours worked
23:00 03:00 (should be 4 but all I get is hash
symbols)

Ideally I do not want to ann in date and times. Is there a simple formula I
have not tried?