hour · n
all hours
C1 very late at night, until early morning, or almost all the time
Dictionary examples:
Our neighbors play loud music at all hours of the day and night. (32.2)
hour
A1 a period of 60 minutes
Dictionary examples:
Two hours of math feels like forever. (0.0)
It takes me an hour to wake up. (0.0)
I waited an hour for my pizza. (0.0)
There are 24 hours in a day. (10.3)
The trip took about three hours. (12.1)
I'll be back in an hour/in two hours. (15.3)
How many hours' sleep do you need? (18.9)
Trains leave every hour on the hour. (23.2)
The exam lasted an hour and a half. (26.0)
hours
B1 a long time
Dictionary examples:
I spent hours looking for my glasses, which were on my head. (0.0)
It took me hours to find my phone, which was in my hand. (0.0)
I waited hours for my computer to turn on, then realized it wasn't plugged in. (0.0)
I spent hours doing my homework. (13.6)
They kept us waiting for hours and hours. (14.5)
the wee hours
C2 the hours between midnight and the time in the morning when people usually begin their day
Dictionary examples:
She worked into the wee hours of the morning. (47.8)