Lead time is the elapsed time between placing an order and having the goods available to sell. In a supply chain it is measured from the moment a purchase order goes to the supplier to the moment the stock is received, checked and live in the warehouse. In a sales context the same word describes the gap between a customer placing an order and receiving it.
It is the single number that decides how much inventory a brand has to carry. Everything downstream, reorder points, safety stock, cash locked in goods, is a function of how long it takes to replace what you sell.
What does lead time actually measure?
The useful definition is not "how long the factory takes". It is how long from the decision to buy until a customer can buy. That stretch contains several blocks that different teams usually own separately, which is why the total is so often underestimated.
That last row is the one brands forget. Stock sitting in your own warehouse is not sellable on Amazon until it has been shipped into the network, received and checked in, and in peak weeks that alone can take a fortnight.
How do you calculate lead time?
Add the blocks:
Lead time = order processing + production + transit + clearance + receiving + channel activation
A worked example for a typical Asia to Europe programme: two days to raise and confirm the order, 30 days to produce, 32 days ocean transit, three days clearance, two days receiving, seven days to inbound and activate at the marketplace. Total 76 days. The supplier quoted 30.
Two refinements matter more than the arithmetic. First, use actuals, not quoted times; pull the last six to twelve purchase orders per supplier and measure what really happened. Second, record the variation as well as the average, because safety stock is sized against the spread, not the mean. A supplier that delivers in 40 days give or take two is far cheaper to carry than one averaging 35 days with a 20-day swing.
Lead time vs. cycle time vs. transit time
These three get used interchangeably and mean different things.
Cycle time is always shorter than lead time, because lead time includes all the queueing before and after the work. A factory with a four-day cycle time can still quote a 40-day lead time if its order book is full. Transit time is just one block inside lead time, and usually not the biggest one.
What makes cross-border lead times longer?
- Customs is a variable, not a constant. A clean entry clears in a day. A query on tariff classification, origin or product documentation can hold a container for a week or more.
- Supplier holidays. Chinese New Year and the European summer shutdown routinely add three to five weeks to anything ordered in the wrong window.
- Ocean schedule reliability. Vessel schedules slip. Rolled bookings, blank sailings and port congestion add days that no supplier contract covers.
- Marketplace receiving queues. Inbound check-in at an Amazon fulfillment center can take a few days in March and a few weeks in October. The stock exists; it just cannot be sold yet.
- Minimum order quantities. A high MOQ forces fewer, larger orders, which stretches the interval between replenishments even when each order arrives on time.
How do brands shorten lead time?
Cutting lead time is mostly about removing queues rather than speeding up work.
- Measure each block separately. You cannot shorten what you report as one number. Split production, transit, clearance and activation, and most programmes find the biggest loss is not where they assumed.
- Pre-file customs. Lodging the entry while the vessel is still sailing turns clearance from a multi-day block into a formality at the gate.
- Hold stock closer to the market. Regional inventory converts a 70-day replenishment into a seven-day one for the final leg, which is the lead time your demand forecast actually has to cover.
- Split shipments by urgency. Air freight the first weeks of cover, ocean the rest. It costs more per unit on a small share of volume and removes the stockout risk on the whole order.
- Reduce the variation, not just the average. A predictable 50 days beats an unpredictable 40, because predictability is what lets you carry less safety stock against the same service level.
FAQ
What does lead time mean in simple terms?
It is how long you wait between asking for something and being able to use or sell it. For a brand buying stock, that is from the day the purchase order goes out to the day the goods are live and sellable.
What is the difference between lead time and cycle time?
Cycle time measures only the hands-on work on a unit. Lead time measures the whole wait, including every queue before production starts and every step after it finishes. Cycle time is always the smaller number.
How does lead time affect how much stock I hold?
Directly. Your reorder point is roughly average daily demand multiplied by lead time, plus safety stock sized against how much that lead time varies. Longer or less predictable lead times force more inventory and more cash tied up to protect the same availability.
Should I use the supplier's quoted lead time?
Only as a starting point. Quoted times cover production and nothing else, and they tend to be optimistic. Use measured actuals from your own order history, and add the transit, clearance, receiving and channel activation blocks the supplier has no view of.
Cutting 20 days out of a replenishment cycle is usually a question of who owns the handoffs, not who ships faster. eBrands runs production follow-up, freight, customs and marketplace inbounding as one chain under a single operator, with the actual lead time per supplier visible in Apollo. See how our supply chain operation works.
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