Na condicional, no local de "" coloque 0 (zero).

Bom dia!!

Talvez.....

=SE($E$6<>"";"0:00";SE(C8="";"";SE(OU(C8=$E$6;C8=$G$6;C8=$I$6);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12<>"";(C12+1)-C11-C13-C14-C15;""));SE(OU(C9=1);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12<>"";(C12+1)-C11-C13-C14-C15;0));SE(OU(C9=2;C9=3;C9=4;C9=5;C9=6;C9=7);0;"??")))))

Basta copiar a Formula de H17 e colar em C17.

Doni

Desculpe não é só copiar e colar!

Doni

Na formula de C17 altere conforme abaixo, que deverá funcionar.
de:
c17 = SE(C8="";"";SE(OU(C8=$E$6;C8=$G$6;C8=$I$6);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12<>"";(C12+1)-C11-C13-C14-C15;""));SE(OU(C9=1);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12<>"";(C12+1)-C11-C13-C14-C15;0));SE(OU(C9=2;C9=3;C9=4;C9=5;C9=6;C9=7);0;"??"))))
Para:
C17 = SE(C8="";"";SE(OU(C8=$E$6;C8=$G$6;C8=$I$6);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12<>"";(C12+1)-C11-C13-C14-C15;0));SE(OU(C9=1);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12<>"";(C12+1)-C11-C13-C14-C15;0));SE(OU(C9=2;C9=3;C9=4;C9=5;C9=6;C9=7);0;"??"))))

Acho que consegui resolver, basta trocar o sinal <> por = onde destaquei em vermelho.
Por favor teste e de retorno!

=SE(C8="";"";SE(OU(C8=$E$6;C8=$G$6;C8=$I$6);SE((C12<>"")*(C12>C11);C12-C11-C13-C14+C15;SE(C12="";(C12+1)-C11-C13-C14-C15;""));SE(OU(C9=1);SE((C12="")*(C12>C11);C12-C11-C13-C14+C15;SE(C12="";(C12+1)-C11-C13-C14-C15;0));SE(OU(C9=2;C9=3;C9=4;C9=5;C9=6;C9=7);0;"??"))))

Doni