Your container arrived on time. Customs clearance completed without incident. And then the invoice from your freight agent arrives with two line items you didn't budget for: $840 in terminal demurrage and $1,120 in shipping line detention. Combined, they nearly equal the original ocean freight you paid.
This isn't unusual. On the China-Africa corridor, demurrage and detention are among the most consistently underestimated costs in any importer's landed cost calculation โ partly because they don't appear in any quote, and partly because most importers don't understand exactly how the clocks work until they're already running. We introduced the mechanics in Your Cargo Takes 45 Days from China (Stage 6). This guide goes deeper into the practical side: how to stay inside your free time windows on this specific corridor.
The Two Clocks, Revisited
Demurrage is what the terminal charges when your container stays in their yard past the free time allowance. The terminal owns that space and needs it for other cargo. Demurrage is their incentive for you to collect promptly.
Detention is what the shipping line charges when you keep their container โ for transport, devanning, and empty return โ past the free time allowance. The shipping line needs that box back in circulation. Detention is their incentive for you to return it promptly.
Both clocks start at port discharge, not at customs release. Both run in parallel. Both continue accumulating regardless of why your cargo is still at the terminal โ whether that's a customs hold, a missing document, a shortage of available trucks, or simply slow internal processing on your end. Neither clock pauses for any of it.
โ ๏ธ Watch Out: Free time periods at African ports are typically shorter than importers accustomed to other trade lanes expect. Terminal free time across several major West and East African ports runs to 5 to 7 days. Shipping line container free time varies by carrier but commonly runs 7 to 14 days from discharge. Neither figure is standardised โ confirm both at the time of booking, not on arrival.
Why African Ports Amplify the Risk
Demurrage and detention exist on every trade lane. But three features of African port operations make them particularly costly on this corridor.
-
Longer customs clearance timelines. A 5 to 10 working day clearance โ entirely normal on this corridor โ can consume most or all of your terminal free time before a collection truck even enters the gate. See: Why Your Cargo Is Stuck at Customs.
-
Port congestion delays. Even after customs release, truck queues and terminal operating constraints at heavily congested ports can add 1 to 3 working days before your container physically exits the terminal.
-
Remote empty depot locations. In some markets, the designated empty container return depot is far from the delivery address, adding trucking time and expense to the return leg โ which itself counts against your detention free days.
What to Do Before the Vessel Arrives
Most of what controls your demurrage and detention exposure is decided weeks before discharge โ not in the days after.
- Confirm free time terms at booking. Ask your forwarder for the terminal free time allowance at your specific destination port and the shipping line's container free time, in writing. These vary by port, carrier, and sometimes by booking terms. Know both numbers before the vessel sails.
- Send shipping documents to your destination broker immediately. The moment your Bill of Lading and supporting documents are issued at origin, send scanned copies to your destination customs broker. Pre-arrival clearance preparation can begin from scans. Every day of preparation before the vessel arrives is a day you don't spend inside your free time window.
- Confirm pre-import authorisations are in place. A missing Form M, ECTN, or PVoC certificate doesn't just delay clearance โ it stops it entirely, while both clocks run. See: Pre-Import Verification Schemes.
- Brief your transporter before the release order is issued. Your truck should be lined up and ready to collect the moment customs releases your cargo. Waiting until release to begin arranging transport burns 1 to 2 days of free time you can't recover.
- Locate the empty return depot in advance. Ask your forwarder which depot your specific carrier uses for empty returns at your destination, and confirm the return deadline. Add it to your delivery plan before the container leaves the terminal.
If the Clock Is Already Running
If your container is already past free time, there are still two variables you control: speed and documentation.
Speed first โ get your broker actively pushing the customs file rather than waiting on it, get your truck booked and confirmed, and make sure your empty return is on the schedule. Every additional day of inaction adds to an accumulating total you can't reverse.
Documentation second โ some carriers and terminals will consider waiving or reducing demurrage and detention if the delay was caused by a documented operational failure on their side (a late discharge, a system error, a misdirected arrival notice). Your forwarder can make this case on your behalf, but they need a clear, documented timeline of events to do it. Undocumented claims rarely succeed.
๐ Pro Tip: If you're shipping FCL and your goods need more than a day to devan at your warehouse, ask your forwarder about extended free time options at the time of booking. Some carriers offer extended container free time for an upfront fee that is often considerably cheaper than paying detention day-by-day after the fact. Also see: FCL or LCL โ How to Choose the Right Shipping Mode for how the two modes handle free time differently.
Want to know your demurrage exposure before you book?
Our Commercial team provides free time terms for your specific port and carrier at the quote stage โ not after the vessel arrives.
Get a Quote โLast reviewed: June 2026 ยท Category: Logistics Insights
Related articles: Your Cargo Takes 45 Days from China ยท FCL or LCL? ยท Why Your Cargo Is Stuck at Customs ยท Pre-Import Verification Schemes
