Charles,

Try this one which will do part hours and has an additional field for
Holidays. If you use it create a named range called 'Holidays' and enter the
dates of any days you want to exclude.

It rurns decial hours/minutes if formatted as general. Remove the *24 from
the end and format as [h]:mm to get time.

=((NETWORKDAYS(A1,B1,Holidays)-1)*("17:00"-"09:00")+MOD(B1,1)-MOD(A1,1))*24



Mike


"Charles Bostic" wrote:

Please help create a formula to calculate total hours serviced for a technician who conducts a service call, which takes him 3 days to complete. If the start date is 10/20/2009 10:00 a.m. and the service is completed on 10/22/2009 12:00 p.m., I would like to collect the total hours in house minus the hours the shop was closed, which is from 5 p.m. to 9 the next morning. The results should be approx. 18 hours of service.

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