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When referring to durations (such as 13 days and two hours), what are rules or correct ways to mention them in-text? Is there a common abbreviation such as 3d 2h or similar?

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This information can be found in APA's Publication Manual, as well as their (7th Ed.) Abbreviations Quick Guide:

  1. Use the time abbreviations shown in the table when they appear with a numeral.

  2. However, do not abbreviate the following larger units of time, even with numerals:

  • Days
  • Weeks
  • Months
  • Years

Table of abbreviations of shorter periods.

Individual publication avenues or institutions may have their own variations.

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  • thank you. So when taking the example above we can write "13 days 2 hrs"? Commented Jul 4, 2022 at 15:01
  • I believe they treat units of time similarly to other units of measurements, meaning you should not add an 's' to make the unit "plural". Hence, it would be "13 days 2 hr".
    – Anyon
    Commented Jul 4, 2022 at 15:13
  • Okay, that makes sense! Commented Jul 4, 2022 at 15:26

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