Two of the biggest avoidable costs in container logistics never show up on a rate sheet — they show up as fees after the fact. Per diem and demurrage are charges for time, and time is the one thing a port-adjacent 3PL can actually control.
Per diem vs. demurrage: what’s the difference?
Demurrage is charged by the terminal when your container sits inside the port past its free time. Per diem (sometimes called detention) is charged by the shipping line when you keep their equipment — the container and chassis — out in the world too long. Both are clocks, and both start whether or not you’re ready.
Why location is the cheapest fix
Free time at the Ports of Long Beach and Los Angeles is short, and it evaporates fast during congestion. The closer your trucks stage to the terminal, the more available appointment windows you can actually hit. Being minutes from the gate means we can pull a box the hour it becomes available instead of the next day.
The container that moves the day it’s ready almost never accrues a fee. The one that waits for an out-of-area trucker usually does.
Five habits that keep the clocks stopped
- Pre-book appointments the moment a container is discharged, not when it’s flagged available.
- Drop-and-hook where possible, so a driver isn’t waiting on a live unload.
- Transload early — move floor-loaded freight onto pallets so the line’s container goes back fast.
- Watch last-free-day dashboards daily and prioritize boxes nearing the cliff.
- Keep empties returning — a return appointment is as important as a pickup.
What to ask a 3PL
Ask how far their yard is from the terminals, whether they manage last-free-day tracking for you, and whether they can transload on-site. If the answer to all three is yes, your per-diem and demurrage exposure drops dramatically — not because of luck, but because someone is watching the clock.
