every four hours

USAGE SUMMARY

The phrase "every four hours" is correct and usable in written English.
You can use it to describe an action that happens at regular intervals. For example, "I need to take my medication every four hours."

✓ Grammatically correct

News & Media

Science

Wiki

Human-verified examples from authoritative sources

Exact Expressions

57 human-written examples

A nice driver will stop every four hours or so.

The New Yorker

Every four hours, Nailah helped them turn her daughter's body.

The New Yorker

Someone who wakes up every four hours may do so regardless of health.

The New York Times

Diarrhoea kills the equivalent of a jumbo-jet full of children every four hours.

The Economist

(The previous record was set in 1969 by Jackie Mason's "A Teaspoon Every Four Hours").

The New York Times

They set alarms to wake every four hours to apply beeswax cream to fingers.

The Guardian

Women also carry out three out of every four hours of unpaid work.

The Guardian

Currently the batteries must be changed as often as every four hours.

The New York Times - Tech

Four jumbo jets' worth of children die of the runs every four hours.

The Guardian - Opinion

The locations of vessels at sea are updated every four hours.

The New York Times

I ask the driver: every four hours, make sure they experience where they are.

The New York Times - Travel

Expert writing Tips

Best practice

For concise writing, consider alternatives like "quadrihourly" in technical or scientific contexts where the audience is familiar with such terms.

Common error

Avoid using "every four hours" when you mean "within four hours". "Every four hours" implies a recurring event at specific intervals, whereas "within four hours" indicates a deadline or timeframe.

Linguistic Context

The phrase "every four hours" functions primarily as an adverbial phrase of frequency. It modifies a verb by specifying how often an action occurs. Ludwig AI provides numerous examples of its use in various contexts, supporting its established grammatical role.

Expression frequency: Very common

Frequent in

News & Media

36%

Science

54%

Wiki

10%

Less common in

Formal & Business

0%

Encyclopedias

0%

Reference

0%

Ludwig's WRAP-UP

The phrase "every four hours" is a common and grammatically correct adverbial phrase used to indicate the frequency of an action. As confirmed by Ludwig AI, it's suitable for various contexts, including news, scientific articles, and general instructions. When using "every four hours", ensure you are accurately conveying the idea of a recurring event at precise intervals, differentiating it from phrases like "within four hours", which indicate a deadline. Consider related phrases like "at four-hour intervals" for formal contexts or "quadrihourly" for concise scientific writing. By following best practices and avoiding common errors, you can effectively communicate time-related information.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

once every four hours

Adds emphasis to the frequency of occurrence.

every four-hour period

Rephrases the time frame as a specific period.

at four-hour intervals

Focuses on the spacing between occurrences.

each four hours

Emphasizes the individual occurrence of each time frame.

every 240 minutes

Expresses the same duration in minutes.

on a four-hourly basis

Adds a formal tone to the frequency.

four hours apart

Highlights the separation in time between events.

at a frequency of four hours

Rephrases to emphasize the frequency.

at four hour cadences

Implies a rhythmic, repeating schedule.

quadrihourly

Uses a single word to denote the four-hour frequency.

FAQs

How can I use "every four hours" in a sentence?

You can use "every four hours" to describe the frequency of an action, such as "The medication needs to be taken "every four hours"" or "The data is backed up "every four hours"".

What's a more formal way to say "every four hours"?

In more formal contexts, you could use phrases like "at four-hour intervals" or "on a four-hourly basis" to convey the same meaning as ""every four hours"".

Is it correct to say "each four hours" instead of "every four hours"?

While "each four hours" is understandable, ""every four hours"" is the more common and natural-sounding phrase in English.

What's the difference between "every four hours" and "within four hours"?

"Every four hours" indicates an action that repeats at four-hour intervals. "Within four hours" means something must happen before the four-hour mark, but not necessarily at recurring intervals.