In short
An AEC-Q100 qualification slips in the gaps: a lot that started late, oven time that was double-booked, a read that waited for an engineer, a report that waited for a review. Each is small; together they move the customer's sign-off. Holding the date means holding every lot, stress, read and report as a commitment with evidence, and re-planning the chain the hour one moves. Tymeline runs qualification programs that way.
Where the weeks go
Stress durations are fixed by the standard, so the schedule's slack is in everything around them: lot starts, equipment time, read-outs, failure analysis when a part fails, and the report and review cycle with the customer. None of those is tracked as a commitment with a date, so each slips quietly.
Holding the chain
Tymeline holds each lot, stress, read and report as a commitment with its evidence in the test floor's data and the lab's bookings. When a lot falls behind, the rest of the chain is re-planned the same day, the recovery is in front of the qualification owner, and the customer is told by you, with a date, before they ask.