Digital supply chain experts project44 say average delays on shipping from China to Europe rose to 6 days in December, after falling for months.
Delays on routes from China to the west coast of the US have also been increasing steadily since October.
Congested ports and production delays have disrupted schedules for months.
"Delays are likely to continue well into 2022," project44 said, "as Covid breakouts continue throughout supply chains and consumers continue to buy at a healthy rate."
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