A system to process at least $166 billion in tariff refunds could be up and running in 45 days. That’s the alternative to a manual process that could take 4 million hours, according to a senior US Customs and Border Protection executive.

President Donald Trump’s top trade negotiator admitted that the 10 - or 15 - percent tariff announced by Trump after the Supreme Court struck down his sweeping “liberation day” levies can only be in place for 150 days without action from Congress despite Trump’s claim to the contrary.

But he said the agency is confident they can develop and implement a new process that will streamline and consolidate refunds and interest payments. The system should be ready in 45 days, he said.

The Supreme Court decision striking down President Donald Trump’s sweeping tariffs has added a wrinkle to already complicated U.S.-China relations.