In G5, copied down:

=INT(ABS((INT($D5)+MOD($D5,1)*10/12)-(INT(E5)+MOD(E5,1)*10/12)))+MOD(ABS((INT($D5)+MOD($D5,1)*10/12)-(INT(E5)+MOD(E5,1)*10/12)),1)*12/10

and then copied to column H... but for column H I get different values are you not using column D and F to calculate H?