night and day

Idioms  

1. Also day and night. Continually, without stopping. This phrase is used either literally, as in The alarm is on night and day, or hyperbolically, as in We were working day and night on these drawings. Shakespeare put it by night and day in The Comedy of Errors (4:2): “Time comes stealing on by night and day.”

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Example Sentences

It's been night and day since O'Neill returned to the club where he'd been revered in his previous stint between 2000 and 2005.

From BBC

So Night and Day was about journalism and its purposes; the Real Thing was about love and infidelity and starred Felicity Kendal, for whom Stoppard left his second wife, the doctor and broadcaster Miriam Stoppard.

From BBC

Many boilers come on every few hours - night and day - to ensure there's always some hot water available.

From BBC

“It’s night and day from where we were a year ago, 100%,” Keselowski said.

From Seattle Times

"We will work night and day to make sure that students have access to specific programs and services that they need and deserve to receive a high-quality public education in Houston schools," she said.

From Salon