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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