Why does release take a day when inspection takes an hour?

Because the rest is waiting, not measuring. The lot sits in quarantine until an inspector is free, then waits again for QA review and sign-off; the queue and paperwork share shows how much.

Where do I get the step times?

From timestamps your ERP or eQMS already records: goods receipt, inspection start, results entry and release. Average them over recent lots of the same part number, not one lot.

Can a proven supplier skip incoming inspection?

Only through documented purchasing controls. ISO 13485 Clause 7.4, incorporated by FDA's regulation, ties supplier evaluation to risk and requires monitoring purchased product performance; skip-lot plans inspect a fraction of lots.

What lead time should the schedule plan for incoming release?

At least the release time shown here, on the same clock the schedule uses. A shorter plan releases work orders that count on parts quality still holds in quarantine.

MedTech Manufacturing calculator

Incoming Lot Release Time Calculator

Find how long an incoming lot takes from receipt to release and whether that fits the lead time planned for it. You need receipt and release timestamps, the sampling plan and a time per point.

What this calculator does

Hours from goods receipt to release of an incoming lot, step by step, against the lead time your schedule allows.

Formula used

Checks per lot = sample size × inspection points per unit
Measurement time (min) = checks per lot × time per point (s) ÷ 60
Lot release time (hours) = receipt to inspection start + measurement time ÷ 60 + documentation and disposition
Queue and paperwork share = (receipt to inspection start + documentation and disposition) ÷ lot release time
Margin to plan = planned release lead time − lot release time

Inputs explained

Receipt to Inspection Start: Quarantine wait, CoC check and gauge setup, from receiving and inspection timestamps.
Sample Size: Units your sampling plan pulls per lot; every unit for 100% inspection.
Inspection Points per Unit: Characteristics and tests per sampled unit, from the incoming inspection instruction.
Time per Point: Handle, measure and record one point, from a time study.
Documentation and Disposition: Inspection record, QA review and sign-off, and ERP release, from timestamps.
Planned Release Lead Time: Receipt to release time your MRP or build schedule allows.

How to use the result

Best suited to setting receiving lead time for a part number, a line waiting on a quarantined lot, deciding where to add incoming inspection capacity.
Lots held for outside lab results or supplier queries wait longer; add that wait to documentation and disposition. Skip-lot receipts released on a CoC alone have no measurement step; this model assumes the lot is sampled.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity with new factory orders at $663B per month (Federal Reserve and Census, Aug 2026).
The U.S. has 8,825 medical equipment and supplies establishments employing about 308,388 workers (Census County Business Patterns, 2023).

Common questions

Why does release take a day when inspection takes an hour? Because the rest is waiting, not measuring. The lot sits in quarantine until an inspector is free, then waits again for QA review and sign-off; the queue and paperwork share shows how much.
Where do I get the step times? From timestamps your ERP or eQMS already records: goods receipt, inspection start, results entry and release. Average them over recent lots of the same part number, not one lot.
Can a proven supplier skip incoming inspection? Only through documented purchasing controls. ISO 13485 Clause 7.4, incorporated by FDA's regulation, ties supplier evaluation to risk and requires monitoring purchased product performance; skip-lot plans inspect a fraction of lots.
What lead time should the schedule plan for incoming release? At least the release time shown here, on the same clock the schedule uses. A shorter plan releases work orders that count on parts quality still holds in quarantine.

Last reviewed 2026-10-01.