What is manufacturing cycle efficiency?

Manufacturing Cycle Efficiency is value add (VA) time divided by non-value add(NVA) time. That is, in the entirety of a process flow or value stream flow, the total of value added time divided by the total of non-value added time. For example, total manufacturing cycle time of 28 days. Of the total, let's say there is 1 day worth of VA time and 27 days of NVA time. That means your cycle efficiency comes to 3.7%.