Delivery Lead Time

Delivery lead time is the elapsed time between when an order is placed and when it reaches the destination or customer. In supply-chain management, it is treated as an order-to-receipt measure that includes order processing, picking/packing, transit, and final handoff, not just line-haul transportation. It is commonly calculated as delivery date minus order date and can be broken into order preparation, production, transit, and receiving time.

On the shop floor, delivery lead time sets the release horizon for raw-material purchase orders so inbound shipments arrive before the production schedule consumes available stock. In warehousing, the same metric drives replenishment timing for finished goods, MRO supplies, and packaging components by measuring elapsed time from purchase-order release or customer-order capture to dock receipt. For raw-material tracking, planners separate supplier processing delay, carrier transit, and receiving delay to set reorder points, safety stock, and inbound appointment capacity. The calculation is typically delivery date minus order date, and it becomes operationally valuable when a single lead-time number is tied to supplier performance, dock scheduling, and material availability status. That value depends on capturing accurate timestamps at every handoff, from order confirmation through ship date, carrier pickup, dock receipt, inspection, and put-away.

• ⚠️Late release of purchase orders: Assuming a shorter lead time than reality pushes raw-material release past the planned build window, so materials arrive late, forcing line stoppages, expediting, and missed shipment commitments.
• ⚠️Dock bottlenecks masked as transport delay: When lead time covers only carrier transit, slow inspection, put-away, or appointment delays at receiving go unseen, making inventory appear late even though the supplier shipped on time.
• ⚠️Calendar and business day confusion: Mixing calendar days and business days distorts reorder points and promised dates, especially when suppliers, carriers, and plants run on different calendars or holiday schedules.