State whether the starting day is included in lead time.
Why can two working days after Friday become five calendar days?
Use the matching calculator
Use this decision sequence
- Choose the supplier working weekdays explicitly.
- Count working days strictly after the stated starting weekday in this model.
- Enter known blackout dates as calendar-day offsets from that start.
- Check the translated result against the supplier’s own timing convention.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Starting Friday | Has offset zero and is excluded. |
| Monday after it | Has calendar offset three. |
| Blackout Monday | Moves the counted completion to a later working day. |
Worked comparison
With Monday-to-Friday working days, two working days strictly after Friday normally finish on Tuesday, four calendar days later. If Monday at offset three is a supplied blackout, Tuesday is the first counted day and Wednesday is the second, giving five calendar days. Repeating the same blackout entry does not exclude an extra day.
Check before using the estimate
National holidays are not inferred. The result translates a convention and is not a promised delivery date. The example values are illustrative arithmetic inputs. Replace them with your measured plan, selected product information and actual quote where relevant.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.