Lead time
Lead time is the elapsed time between initiating replenishment and receiving inventory ready for use. It can include order processing, production, transport and checking. Expected demand during this interval influences the reorder point, while variability may justify buffer inventory. Ensure the start and end points match the question’s definition and use a consistent time unit. Lead time differs from the length of an inventory ordering cycle.
Worked example
At demand of 30 units per day and a four-day replenishment lead time, expected lead-time demand is 120 units before any safety-stock allowance.
Common mistake
A weekly usage rate cannot be multiplied directly by a lead time stated in days without converting units.
Where it appears in your exams
| Qualification | Exam | Relationship | Period |
|---|---|---|---|
| ACCA | MA | Direct | September 2026–June 2027 |
| FIA | FMA | Direct | September 2026–June 2027 |
