Lead Time Explainer
Lead time is the elapsed time between a defined starting event and completion. In purchasing it may run from order placement to receipt; in production, from release to finished goods; in customer service, from request to resolution. The endpoints must be explicit.
Total lead time includes more than hands-on processing. Waiting, queues, approvals, batching, changeovers, transport, inspection, and rework may dominate the calendar. Average lead time can hide the late tail that drives missed promises and excess safety stock.
Businesses distinguish quoted, planned, supplier, production, replenishment, and customer lead times. Variability matters because planners need protection against both demand uncertainty and delivery uncertainty. A faster but unstable process can be harder to manage than a slightly slower reliable one.
Improvement begins by mapping timestamps and removing delay, rework, unclear priorities, oversized batches, and avoidable handoffs. Do not compress time by skipping safety or quality controls. Track median and percentile performance, communicate realistic promises, and update planning parameters from actual evidence.
State exactly what starts and ends the clock.
Different lead-time definitions can produce incompatible figures.
Queues, approvals, batching, transport, and rework add calendar time.
Map elapsed time, not only touch time.
Average performance can hide a long late tail.
Use percentiles and on-time results when commitments matter.
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