Just change the formula to

=H2-F2+(F2=H2)-J2/24


--
HTH

Bob Phillips

(replace somewhere in email address with gmail if mailing direct)

"Joco" wrote in message
...
Bob Hi

Thanks for your reply, it's so simple when you know how.

In order to make your formula do what I want I have change your +J2/24 to
-J2/24
There is one cell where the answer to the formula is XXXXX this has been
caused be cell lands up with a negative time which is not permissable.

The cause of the error is because the take of time (F) and the landing
time
(H) are identical ie 09:40 and 09:40 due to a refueling stop. If you know
a
fix for this great, if not dont worry I have reduced the second time (H)
to
09:39 and it cures the problem

I only have only mentioned the above so you are aware of it.

Once again many thanks for the great formula.

Regards Joco