at all hours (of the day and night)

at all hours (of the day and night)

At any time of the day or night. This phrase is usually said with a note of annoyance because something has happened at an inappropriate time. Please tell your girlfriend to stop calling our house at all hours of the day and night. I haven't slept in days—my neighbor's dog has been barking at all hours.
See also: all, and, hour