C1 整天不断地;昼夜不停地
repeatedly during the day and the night
They keep calling me at all hours (of the day and night). 他们整天不停地给我打电话。
Their poor dog barked at all hours.
They played loud music at all hours of the day and night.
We noticed cars coming at going at all hours.
The house was occupied by students, who came and went at all hours.
See also: hour