Excell does work like that! ie for a flight of 8hrs 57min you put 8:57
You have to use the format including seconds at the one for just hrs:min
will
give you a false reading at higher values.
I have entered my logbook for over 600 flights using this method and it
works
for me.


OK try summing a few time that when added are greater than 24 hrs. Or put a
time in of 45hrs 36mins and see what it does then.

Peter

Entered it, added it, it worked!!!
Read and try it