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Peak Pegasus, which has 70,000 tonnes of US soybeans on board, docked on Saturday, more than a month after it arrived off China's coast just hours after 25-percent import duties were imposed on US goods as part of the tit-for-tat trade row between Beijing and Washington.
The official, who is in charge of bulk vessels at the Beiliang dry bulk terminal at Dalian port, said it typically takes between 1.5 and three days to unload cargoes.
He declined to be named as he is not authorised to speak to media.
China's state grain stockpiler Sinograin, which has bought the cargo, did not respond to requests for comment.