Field note
Ask the main factory what must reach it before production can start. A paid order can still wait for another supplier to deliver a component, or for you to approve a design. Saturday brought both kinds of wait. Each changes the date from which you can count the quoted manufacturing time.
The labels had their own supplier
A seller wanted a custom care label on a textile product. The sourcing reply put label production with a separate supplier, who quoted about a week. The main factory would arrange production after receiving those labels. Its manufacturing time came after that arrival, so the seller could not count both jobs from the same starting date.
That reply described a proposed sequence. It did not report that the labels had arrived or that the main factory had started. For a launch plan, the useful next question was when the labels would reach the factory. A label completion date alone would leave the handoff unresolved.
The design still needed the seller
A different custom order needed a design render before manufacturing. The supplier planned to provide it after the weekend, then the seller would need to confirm it. The reply separated production from the later journey to the warehouse. It did not give the seller an approved design or a completed item.
Here, another delivery from a label maker would not unlock the job. The seller had to review the render first. If you will be away when that file arrives, name someone who can check it against your artwork and reply. Ask the supplier when production can start after that reply, rather than assuming the render date starts the clock.
Put an owner beside the factory start date
For a job with separate labels, ask who will send them and who at the main factory will confirm receipt. Keep the expected arrival date beside the factory start date. For a design render, name your approver and agree when the supplier should expect the answer. Those names and dates give you a way to chase the step that still holds the job.
The sample-order guide already explains why bulk lead time follows the sample stage. Apply that check to the last input your particular job needs, including a component from another maker. Before you promise a launch date, obtain the expected receipt or approval date, the person who will confirm it, and the factory start date that follows.