day and night
all the time:
You can hear the traffic from your room day and night.

[TahlilGaran] Advanced Learner's Dictionary ▲

day and night
all the time.
It takes a while to get used to hearing traffic noise day and night.

[TahlilGaran] English Idioms Dictionary ▲

day and night
all of the time
We worked day and night to finish the project before the end of the month.

[TahlilGaran] English Idioms Dictionary ▲

day and night
adv.
1. For days without stopping; continually.
Synonym: AROUND THE CLOCK.
Some filling stations on great highways are open day and night 365 days a year.
The three men took turns driving the truck, and they drove night and day for three days.
2. Every day and every evening.
The girl knitted day and night to finish the sweater before her mother's birthday.

[TahlilGaran] English Idioms Dictionary ▲