Plant Shutdowns, National Holidays and the Weeks Nobody Ships

A buyer once complained to me that his supplier “always” slipped one week in early October and again in mid-November. Not CNY. Not the National Day holiday. Just a week, twice a year, every year. When I asked the factory, they said the plating line was closed for maintenance in early October and the paint shop was shut for the environmental inspection in November. The buyer had a two-year relationship and had never been told.

Lead time is not a number. It is a number produced at one specific factory, on one specific set of lines, with a calendar attached. Here is the calendar that actually matters, month by month.

The fixed dates first

Spring Festival. You already know about it. What you may not know is how variable the restart is. A big plant with hired labour back from the provinces may be at 70% output in week two. A smaller plant may be at 40% for three weeks. Do not assume “reopening” means “running”.

National Day (October 1). Officially a seven-day holiday. The reality: many factories run through the first three days and close the middle, or shut entirely and run a make-up day the following Saturday. Freight is a bigger problem. Ports stay open, but trucking and customs brokers thin out, and container booking in the week of 1 October is miserable.

Labour Day (May 1). Usually 5 days, less disruptive than National Day but it lands in the middle of peak spring production for many product categories.

Qingming, Dragon Boat, Mid-Autumn. One to three days each. Small individually, annoying cumulatively. Dragon Boat lands in June, which is often the busiest shipping month for anyone shipping into Europe ahead of back-to-school.

The ones that don't appear on any government calendar

Plant maintenance shutdown. Sintering furnaces, plating lines, paint lines and kilns need to be shut, cooled, cleaned and restarted. This is not optional. It is scheduled. Every plant has a shutdown period, often 3 to 10 days, usually twice a year, and it is almost never written into the order acknowledgement. Ask in writing: “What are your planned shutdown dates for the next 12 months?” Most factories can answer this. If they cannot, that tells you something about their planning too.

Environmental inspection season. Local ecology and environment bureaus run inspection rounds, and the factories with weak compliance get told to pause. When that happens, plants with cleaner processes keep running and the rest stop for a week or two. If your supplier is a small plating, paint or casting shop, ask about their environmental permit status and recent inspection record. This is a legitimate question and a good one: a supplier with a valid air and water discharge permit, current, is less likely to be the one that gets stopped.

State-grid load management. In hot summers and cold winters, provincial grids impose rationing on industrial users. A factory may be limited to running heavy equipment between 10:00 and 16:00, or barred from peak hours entirely. This shows up as a lead time extension of 10-20% with no other explanation. It hits energy-intensive lines: injection moulding machines, compressors, casting, annealing.

Customer audits. If your supplier has a big customer audit in a given month, everything else pauses for three to five days while the plant cleans and documents. Sometimes the audit itself is fine and the two weeks before it are chaos. Ask if there are audits in your production window.

Local construction and relocation. Factories in growth districts around Shenzhen and Dongguan occasionally get moved. If the address is a leased building with no long-term history, ask how long they have been there and whether the lease is secure. Hundreds of factories move every year and the relocation means 4-8 weeks of zero output.

How I build a real lead time

When a supplier quotes 35 days, I do this:

• Ask what the 35 days covers. Does it include material arrival or only production? Is it from PO or from deposit received? From artwork approval or from deposit?
• Ask for the last five completed orders for a similar product, with PO date, deposit date, actual ship date. Compare. Roughly 40% of quoted lead times are wrong, and the direction is almost always optimistic.
• Add the seasonal calendar: any holiday, shutdown, inspection or audit that falls in the window. Then add the port period — late booking is the most common reason a finished order misses its vessel, not production issues.
• Add buffer separately, and tell the supplier what it is. “35 days + 5 days buffer” is a different sentence than “40 days” because in the first the plant knows the extra five days is not negotiable.

What to put in the contract

The order acknowledgement should name the shutdown windows. A single line — “Planned shutdowns for next 12 months: 8-12 October (plating maintenance), 20-30 January (CNY)” — is worth more than any delay clause. Delay clauses get argued. Shutdown dates get planned around.

If you are a seasonal buyer (Christmas, back-to-school), you have a hard deadline. Then treat any shutdown in the three months before your date as a reason to increase the buffer or move production earlier. It is not the factory being difficult. It is the factory being honest.

And keep in mind what the buyer in my story never did: ask. He had worked with that factory for two years and did not know its shutdown dates. That is on both of them, but on the buyer more.