=Networkdays Help Needed

I am trying to subtract two times from each other using the formula below. I do not want to count Saturday or Sunday and I have found a formula that works perfect when an item arrives Monday thru Friday. But, when the item arrives on Saturday at 5am and is finished processing on Monday at 5pm it says 1 day and 12 hours and when the item arrives on Saturday at 5pm it says 1 day. When the item arrives on the weekend count should stop.

E13 is start day/time
M13 is end day/Time
F13 is start shift time
N13 is end shift time

=IF(AND(INT(E13)=INT(M13),NOT(ISNA(MATCH(INT(E13),
HolidayList,0)))),"0 days 0 hours", IF(INT(E13)=INT(M13),
"0 days " & ROUND(24*(M13-E13),2)&"hours",
MAX(NETWORKDAYS(E13+1,M13-1,HolidayList),0)+
INT(24*(((M13-INT(M13))-(E13-INT(E13)))+
(N13-F13))/(24*(N13-F13)))&
" days "&MOD(ROUND(((24*(M13-INT(M13)))-24*F13)+
(24*N13-(24*(E13-INT(E13)))),2),
ROUND((24*(N13-F13)),2))&" hours "))