=IF(AND(DAY(A2)<>DAY(B2),MONTH(A2)<>MONTH(B2),OR(MOD(A2,1)>MOD(B2,1),MOD(A2,1)<MOD(B2,1))),TEXT((24*(NETWORKDAYS(A2,B2,RDATA!$AC$2:$AC$71))-24*((MOD(A2,1)-MOD(B2,1))))/24-1,"d/hh/mm"),IF(AND(DAY(A2)<>DAY(B2),MONTH(A2)=MONTH(B2),MOD(A2,1)<MOD(B2,1)),TEXT((24*(NETWORKDAYS(A2,B2,RDATA!$AC$2:$AC$71))-24*((MOD(A2,1)-MOD(B2,1))))/24-1,"d/hh/mm"),IF(AND(DAY(A2)<>DAY(B2),MONTH(A2)=MONTH(B2),MOD(A2,1)>=MOD(B2,1),MAX(A2:B2)-MIN(A2:B2)>=6),NETWORKDAYS(A2,B2,RDATA!$AC$2:$AC$71)-IF(MOD(A2,1)<=MOD(B2,1),0,1)-1&"/"&TEXT(B2-A2,"hh")&"/"&RIGHT(TEXT(B2-A2,"hh:mm"),2),IF(AND(DAY(A2)<>DAY(B2),MONTH(A2)=MONTH(B2),MOD(A2,1)>MOD(B2,1),MAX(A2:B2)-MIN(A2:B2)<6),NETWORKDAYS(A2,B2,RDATA!$AC$2:$AC$71)-IF(MOD(A2,1)<=MOD(B2,1),0,1)&"/"&TEXT(B2-A2,"hh")&"/"&RIGHT(TEXT(B2-A2,"hh:mm"),2),IF(AND(DAY(A2)=DAY(B2),MONTH(A2)=MONTH(B2),MOD(A2,1)<MOD(B2,1)),NETWORKDAYS(A2,B2,RDATA!$AC$2:$AC$71)-IF(MOD(A2,1)<=MOD(B2,1),0,1)-1&"/"&TEXT(B2-A2,"hh")&"/"&RIGHT(TEXT(B2-A2,"hh:mm"),2),"")))))
Best