What Is Lead Time?
Ask a supplier how long an order takes and the answer will quietly leave out both ends of the job.
Lead time is the total gap between raising a request to buy something and having it in stock, checked and ready to sell. Four stages sit inside that gap, and the delivery date a supplier quotes covers only two of them. In India it usually lands longer than the quote, because approval at your end and inspection on arrival both take days nobody counts.
What You Are Actually Measuring
The clock starts before the supplier has heard from you. A request has to be approved and turned into a purchase order, and that step alone can eat two or three days waiting on one signature.
Four stages make up the whole:
- Approval. From the request being raised to the order going out.
- Preparation. The supplier making or picking your goods.
- Transit. Goods on the road, rail or water.
- Checking. Counting and inspecting against the goods receipt note.
Lead time = the date stock becomes sellable, minus the date the request was raised
Transit carries a legal clock of its own. Under rule 138 of the CGST Rules an e-way bill for ordinary cargo is valid for one day per 200 km, counted to midnight of the day after it was generated, so a 1,600 km haul gets eight days. A transporter can extend that in exceptional circumstances, within eight hours from expiry, so it is the bill nobody is watching that leaves a vehicle held.
Lead Time vs Delivery Time
This is where the two numbers part company.
| Aspect | Lead time | Delivery time |
|---|---|---|
| Starts | You raise the order | Supplier dispatches |
| Ends | Stock is sellable | Goods reach you |
| Covers | All four stages | The transit leg |
| Source | Your own records | The supplier’s quote |
Suppliers do not use the phrase the same way. Some start their delivery clock on the day they dispatch, others on the day you confirm the order, and a few fold in an unwritten packing window. Ask which day theirs begins.
Lead Time Example
A saree retailer in Bhagalpur orders Rs.6,80,400 of stock from a mill in Surat in September 2026. The mill quotes eighteen days.
| Stage | Days |
|---|---|
| Approval | 3 |
| Supplier | 12 |
| Transit | 6 |
| Checking | 2 |
| Total | 23 |
Note: this is an invented example for illustration only. Your own stages depend on your approval process and the route your goods travel.
Twenty-three days, against the eighteen quoted. That gap sets the level at which a fresh order has to go out:
Reorder point = (average daily usage x lead time in days) + safety stock
At 14 sarees a day with 120 held back as safety stock, the honest figure is 442. Take the mill’s eighteen days instead and you reorder at 372, and those seventy sarees come straight out of the safety stock meant to absorb a supplier slipping.
How to Reduce Lead Time
Begin with the stage you own outright. Approval costs nothing to fix and is usually the quickest win, because it is a signature waiting in an inbox, not anything happening in a factory.
The supplier’s stages are harder, though not fixed. A second source for your fastest-moving items gives you somewhere to turn when the first one slips, and our comparison of HyperPure, DMart and local vendors shows how differently the three behave on timing. Pair it with demand forecasting and the reorder point stops being a guess.
Then there is the part most owners skip: writing down what actually happened. A vendor evaluation template already scores delivery beside quality and price, and a quarter of real receipt dates beside each supplier’s promise beats any amount of negotiating.
Shorter is not always the goal, either. A supplier who takes a reliable twenty days beats one who swings between twelve and thirty, because you can plan around the first and only gamble on the second.
Spot the Gap Before You Run Out
Every figure on this page comes out of records somebody kept: the day the order went out, the day the goods landed, the day they were counted in.
For retail businesses, Petpooja Invoice carries Inventory Management & Stock Transfer, Warehouse Management and Purchase Automation, so what arrived and when is written down rather than remembered.
For restaurants, Petpooja POSS runs item-wise auto deduction, low-stock alerts and day-end inventory reports, so you hear an item is running down before a guest does.
Most stockouts are not buying mistakes. They come from a date nobody wrote down, and our note on the inventory mistakes retail stores make covers the rest. Have a look at what last month’s receipts say about your slowest supplier.
Frequently Asked Questions
Delivery time is the transit leg alone, from dispatch to your door. The wider figure wraps around that and adds your own approval at the front and your goods check at the back, so it always runs longer.
Subtract the date the purchase request was raised from the date the stock became sellable. Do it across the last ten orders and use the average, because one order tells you nothing about how a supplier normally behaves.
Yes. Stock sitting in your receiving bay unverified cannot be sold, so those days belong inside the number. Leaving them out is a common reason a reorder point comes out too low.
Because safety stock is sized on the worst case, not the average. A supplier swinging between twelve and thirty days pushes that ceiling far above what you normally get through, while a steady thirty-day supplier needs almost no buffer at all.
