Definition of “night and day”

As the Carlo Alberto raced up the North Sea, Marconi worked night and day testing his magnetic detector.

But now, night and day , there was this tumult going on inside me.

But since my second operation, last summer, it has been like night and day.

But they will not be guarding the six prisoners night and day.

Engineers from Telecom contractor Downer Connect have been working night and day to visit and repair each payphone.

He cut out the terraces, tended his vines, cherished and watered them, worked night and day for a year.

I left it on 1,600-by-1,200 and took shots inside, outside, night and day.

It fluctuates after heavy exercise or emotional stress or even time of night and day.

She knew what it was because it was an echo of the very thing she heard in herself, night and day , awake and dreaming.