Find the end date & time considering work hours

based on your sample one option below (which will return your expected result):

Formula:

C7:

=WORKDAY($C$5,CEILING(($C$6+MOD($C$5,1)-$C$3)/($D$3-$C$3),1)-1)+MOD($C$5,1)+$C$6-CEILING(MOD($C$5,1)+$C$6-$C$3,$D$3-$C$3)+$D$3-$C$3

format as m/d h:mm:ss AM/PM

the above is an approach provided by an old poster here (daddylonglegs)

Thank you! Worked out perfectly.