question: private long calculateMillisFor ( MPPOrderNode node , long commonBase ) { final BigDecimal qty = node . getQtyToDeliver ( ) ; long totalDuration = + node . getQueuingTime ( ) + node . getSetupTimeRequired ( ) + node . getMovingTime ( ) + node . getWaitingTime ( ) ; final BigDecimal workingTime = routingService . estimateWorkingTime ( node , qty ) ; totalDuration += workingTime . doubleValue ( ) ; return ( long ) ( totalDuration * commonBase * 1000 ) ; }
target:  Calculate how many millis take to complete given qty on given node(operation).