till all hours (of the day and night)

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till all hours (of the day and night)

Until a very late hour of the night or very early hour of the morning. Johnny keeps taking the car and staying out till all hours, and I just don't know what to do anymore! My boyfriend lives in another state, so to make up for the long distance, we stay up talking till all hours of the day and night.
See also: all, and, hour, till

till (or to) all hours

till very late. informal
See also: all, hour, till