The Runtime Method is either Hours, Time/Piece,  Parts/Hour, or Time/Lot.

Hours ignores operation quantity and the value entered to runtime is the runtime for the operation.  If the runtime method is Hours and the Sequence Type is Lot or Lot Optimum, the scheduler will automatically calculate the lot sizes for overlap by dividing the operation runtime hours by the quantity to build.  This method enables the scheduler to overlap operations with a runtime of Hours by the correct lot sizes.  If you do not want to overlap by lot sizes when using hours and the Lot command, change the sequence type to Sequential before the operation with the runtime method of Hours.

Time/Piece is the time a quantity of 1 takes. If this value is .5 and the operation quantity to build is 10 then the operation will be scheduled to take 10 X .5 = 5 hours.

Parts/Hour is the amount of parts that can be produced in 1 hour. If this value is 5 and the operation quantity to build is 10 then the scheduled time for the operation will be 10/5 = 2 hours. 

Time/Lot is the amount of time to process one lot regardless of the lot size.  That is, the lot size can vary, but the operation time per lot remains the same.  Time/Lot is calculated by Number of Lots x Runtime.  For example, if the runtime is 2 hours and the lot size is 16 with a job quantity of 150, the operation will be scheduled to take:

            150 / 16 = 10 lots (number of lots is rounded up to the next highest whole number)

            Operation time = 10 lots x 2 hours per lot, or 20 hours.