Having just downloaded the OEE module I am at the very beginning of trying to understand it but I seem to have found a problem. I have entered a Work order of 300 units and the line has a Default Production Rate of 50. When I go to the Schedule page and enter this job if I start the job 1:00am or later it gives a finish time of 6 hours 45 minutes (breaks I assume), OK. If I try to plan the job to start between 12:00am and 12:59am the finish time is 17 days ahead at 12:16PM. 
Downloaded and installed on seperate laptop and problem has gone away???