I'd like to have one day off.

我想请一天假。

youdao

The doctor says I need one day off.

医生说我需要休息一天。

youdao

May I have one day off?

我可以请一天假吗？

youdao

But there are already plans for defence workers to take one day off a week without pay.

BBC: Sequester: When budget cuts are a matter of life and death

More than 600 teachers across 13 councils had at least one day off because of stress last year.

BBC: 21,000 teaching days lost to stress in Wales in 2009

The FAA has ordered all of its 47, 000 employees (27, 000 of which are air controllers) to take one day off per ten work days without pay.

FORBES: Sequester Scaremongers Caught Red Handed on Air Controller Cuts