Workers at the courts of Guam, in the Pacific, will have their working week cut to 32 hours from Friday, as the judiciary tries to cut costs.
The so-called furloughs were approved by the Judicial Council in April and were originally scheduled to begin in May.
But they were delayed until this month, when a funding shortfall called for their implementation.
It means all employees, including justices and judges, will now work only four days a week.
Contracts with some vendors have already been cut.
Court operating hours have been reduced by an hour a day.