Hi
When the start and end times are formatted as DateTime (p.e. "dd.mm.yyy
hh.mm"), then simply
=EndTime-StartTime
and format the result as Custom "[h]:mm"
When the start and end times are formatted as Time, and the difference never
reaches 24 hrs, then
=EndTime-StartTime + (StartTime>EndTime)
and format the result as Time ("h:mm")
Arvi Laanemets