Use the full time needed to replenish usable stock, then test a delayed-arrival scenario. Vessel transit alone can hide production, collection and receiving time.
Reviewed 5 October 2026
Our planning worksheet separates supplier production, domestic collection, waiting for departure, international transport, destination handling and receipt into usable stock. Use recent comparable shipment records and record which durations remain estimates. For furniture or bulky goods, include receiving capacity and storage cost when choosing the shipment quantity. A reported 90-day journey is one seller’s situation, not a standard service promise.
Amazon’s inventory guide presents a reorder point using average daily sales, lead time and buffer stock. In our illustrative scenario, demand is 3 units per day, full lead time is 60 days and the chosen buffer is 30 units: the trigger is 210 units. This is a planning example, not an Amazon quantity recommendation. Count stock in transit separately and assess whether it can become usable before it is needed; avoid counting the same units twice.
With the same illustrative demand, a 15-day delay uses another 45 units. The chosen 30-unit buffer would not cover that entire delay. If expected sales rise to 5 units per day, recalculate demand for the relevant periods rather than multiplying a promotional peak across every day. Record base demand, promotional assumptions and the date those assumptions were reviewed. Buffer levels are a business choice balancing stockout risk, cash and storage.
Before dividing an order, compare the additional handling and freight costs, supplier readiness and each batch’s receiving plan. Confirm whether batches share the same vessel or downstream facility. Set a review date and a maximum approved quantity and cost for emergency replenishment. If demand weakens, review whether the remaining unshipped quantity can be reduced or rescheduled under the supplier agreement. An air shipment also needs cargo acceptance and an agreed delivery scope.
Illustrative arithmetic: 3 units/day × 60 days + 30 buffer units = 210 units. If lead time becomes 75 days, the same method gives 255 units. These quantities are invented and are neither a quote nor a customer case.
Download The Planning Sheet In EnglishThe worksheet is a planning aid. Seasonal demand, purchase commitments and usable-stock definitions require your own records. No shipment schedule or stock availability is guaranteed.
The receiving, checks, packing, charges and release scope are confirmed in writing for each shipment. Visible checks do not establish authenticity or functional performance.
