Dwell time
Dwell time measures how long freight, containers, trailers, or transport assets sit idle at a node (a port terminal, rail ramp, yard, dock, or distribution center) between arrival and the next productive move. It is the operational quantity behind demurrage and detention fees, and on long international lanes accumulated dwell at handoffs can rival the time the goods spend actually moving.
Examples
Terminal dwell: A container of stampings discharges Friday at 6 a.m. and is not picked up until the following Wednesday: 5 days of dwell, 2 of them past free time, generating $560 in demurrage at $280 a day and pushing the material past its production slot.
Yard dwell as hidden inventory: An audit finds 22 loaded trailers averaging 2.8 days in a plant yard, holding roughly $1.9 million in parts that planners are actively expediting because nothing shows as received.
Dock-to-stock: A DC measures dwell from trailer unload to putaway at 26 hours. Slotting changes and a second putaway shift cut it to 7 hours, shortening effective replenishment lead time by nearly a day without touching transit.
Definition
Dwell is the clock; demurrage and detention are the invoices that arrive when the clock runs past free time. The distinction matters because fees are only the visible fraction: dwell inside free time still costs money, through longer effective lead times, more pipeline inventory, and trucks, chassis, and containers tied up doing nothing.
It hides at every handoff. A container discharged Monday but picked up Thursday adds three days no transit-time quote mentions, which is why a vessel's ETA says little about when material actually reaches the line. A loaded trailer parked in the yard while receiving works through a backlog is inventory the planning system cannot see. Pallets received but not yet put away are findable by no one.
Measuring dwell means timestamping every transition: gate arrival, unload start, unload end, putaway, departure. Look at the distribution, not the average; a 6-hour mean with a 4-day tail is a planning problem the mean conceals.
The fixes are mostly unglamorous: dock appointment discipline, drayage capacity booked before vessel arrival, free-time terms negotiated into freight contracts, and a yard management system so trailers stop disappearing between the gate and the door.
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