Conditional Formating - Time difference

[Guest]

I have 2 columns, Column A for 'Arrival Time' and Column B for 'Departure
Time' .
If the 'departure Time' minus 'Arrival Time' is greater than 8 hrs,
background color of both the columns A and B should be changed to green,
otherwise color should be red. How can I achieve this using conditional
formatting?

 

[Guest]

Highlight column A:

CF 1: Formula is: =AND(A1<>"",B1<>"",(B1-A1+(B1<A1))*24>8) and set to green
CF2: Formula is: ==AND(A1<>"",B1<>"",(B1-A1+(B1<A1))*24<=8) and set to red

Repeat for column B

HTH

 

[Bob Phillips]

alternatives

=AND(COUNT(A1:B1)=2,MOD(B1-A1,1)*24>8)

=AND(COUNT(A1:B1)=2,MOD(B1-A1,1)*24<=8)

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HTH

Bob

(there's no email, no snail mail, but somewhere should be gmail in my addy)