Thirty days, in writing, with a list
Maher requires mitigation, waiver or refund requests in writing as soon as possible and in no event later than thirty calendar days after the invoice date or issuance date. The request has to carry the container and bill of lading numbers, the vessel name and voyage, the carrier that issued the bill, confirmation that no holds remain, the dates contested, the amount sought, the reason, and the supporting documents. Its customer service undertakes to decide within two business days of a complete submission.
The federal layer moved recently
The Federal Maritime Commission billing rule took effect on May 28, 2024 and set a thirty calendar day deadline for issuing demurrage and detention invoices. The provision naming who may be billed did not survive: the D.C. Circuit set aside 46 CFR 541.4 in World Shipping Council v. FMC on September 23, 2025, and the Commission removed the section effective December 29, 2025. The invoicing deadlines stand; who may lawfully be invoiced is open again.
After thirty days the cargo may not be yours
Under the same terminal schedule, cargo left on the terminal beyond thirty days may be treated as abandoned and sold against the charges owed, with notice sent to the carrier or the owner of record. Cargo subject to spoilage or rapid devaluation can be treated as abandoned from the expiry of free time.