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24 hours per day vs 24 hours a dayu

Both phrases are similar in meaning and correct to use. However, the more common and standard phrase is '24 hours a day.' It is used to indicate that something is available or happens continuously without interruption.

Last updated: March 22, 2024

24 hours per day

This phrase is correct but less common than '24 hours a day.'

This phrase is used to indicate that something happens or is available for the entire duration of a day, without specifying the exact number of hours.

Examples:

  • The store is open 24 hours per day.

Alternatives:

  • 24 hours a day
  • all day and night
  • around the clock
  • day and night
  • non-stop

24 hours a dayu

This is the more common and standard phrase to indicate something is available or happens continuously without interruption.

This phrase is used to convey that something is available or happens continuously without interruption, throughout the entire day.

Examples:

  • The hotline is available 24 hours a day.

Alternatives:

  • 24 hours per day
  • all day and night
  • around the clock
  • day and night
  • non-stop

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