comment on this Post. Lean manufacturing is the amount of time it takes a product to be completed or move through the production process. It is the very beginning of manufacturing to its completion. Value-added lead time is the amount of time spent on producing the product or providing a product or service. There is also the added value of how much the customer is willing to pay. An example of this would be the amount of time a doctor spends helping a patient. Non-value added lead time is the amount of time the product is in production but when no value is being added. The time spent is not making the product valuable. An example of this would be transportation time moving from place to place