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At all hours vs At any hour

at all hourscontinuously, especially at unusual or irregular times:

  • His songs are heard everywhere in the country and at all hours.

Cf.: until all hours —(also: until all hours of the night) until very late at night:

  • I lived the crazy life of a student—studying until all hours, living in front of my computer, all that.

Note: The expression does not correlate in meaning with the phrase at all timeson all occasions; always:

  • The accessibility of Italy upon this side was at all times a matter of anxiety to her rulers.

at any hourat any time; whenever one chooses:

  • The knowledge that he might at any hour be called upon stimulated his studies of his duties.

See also: at any one time / at any time.