Following are my values:-
A1= 07/11/08 09:00
A2= 07/21/08 11:00
B1= 08:00
B2= 17:00

I dont have any holidays within this period. But when I try to use the
formula, which I could see in another discussion:-

A3=(NETWORKDAYS(A1,A2,C1:C8)-1)*(B2-
B1)+IF(NETWORKDAYS(A2,A2),MEDIAN(MOD(A2,1),B2,B1), B2)-
MEDIAN(NETWORKDAYS(A1,A1)*MOD(A1,1),B2,B1)

then I am getting the answer as 2.33 ( which seems to be incorrect
here).
Could you please guide me where I am making mistake?