From GAWDAwiki
Lead time is the amount of time required for an item to be available for use from the time it is ordered. Lead time should include purchase order processing time, vendor processing time, in-transit time, receiving, inspection and any pre-pack times. However, based on the way many inventory systems work, there may be problems incorporating internal factors such as post-receipt processing in lead-time, so in many systems the lead time simply represents the period of time from which the item is ordered to the time it arrives at the end-user's dock. See also effective lead time.[1]
References
- http://www.inventoryops.com/dictionary.htm