Eric,

Try this

=workday(A30,INT(A29/8))+MOD(A30,1)+MOD(A29,8)/24+(N((MOD(A30,1)+MOD(A29,8)/
24)13/24)/24)+(N((MOD(A30,1)+MOD(A29,8)/24)17/24)/24)

This assumes weekdays only. IF you want to include Sat anmd Sun, use

=A30+INT(A29/8)+MOD(A29,8)/24+(N((MOD(A30,1)+MOD(A29,8)/24)13/24)/24)+(N((M
OD(A30,1)+MOD(A29,8)/24)17/24)/24)

Both assume the start date/time in A30, the number of hours in A29

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Eric" wrote in message
...
Does anyone know how to project the due date according to a required
number
of working hours? such as

If today is 24 Oct, 2005 (Monday) at 9:00am, my project required 100 hours
to be finished, then how to create a formula and to project the due date
in
excel sheet?

Working hour: 9am - 1pm and 2pm - 5pm (total 8 working hour per day)

Thank for any suggestion
Eric