Hi ladies and Gentleman

I am seeknig assistance with a excel formula, I am trying to get the following figured.

e.g

A1 (holds the time 09:00)
B1 (holds the time 10:00)
C1 (holds the Total time 1:00) using =SUM(B1-A1)

Then same repeated in

D1 (holds the time 09:00)
E1 (holds the time 10:00)
F1 (holds the Total time 1:00) using =SUM(E1-D1)

I would like G1 to highlight as a colour if the time difference between C1 & F1 Exceed 12 Hours (an employee must have a total of 12 hours rest period between shifts.

I could really appreciate some assistance.

Thank you in advance.