unknown duration

USAGE SUMMARY

The phrase "unknown duration" is correct and usable in written English.
It can be used to describe a time period that is not specified or cannot be determined. Example: "The project is currently on hold for an unknown duration due to unforeseen circumstances."

✓ Grammatically correct

News & Media

Science

Encyclopedias

Human-verified examples from authoritative sources

Exact Expressions

54 human-written examples

It would be the start of a war of unknown duration and immense human, material, and political cost.

The New Yorker

As the American involvement in Iraq has become a commitment of unknown duration, comparisons to the Vietnam War are more and more common.

The New York Times

But industry analysts said that the drug companies faced a battle to expand the target audience in America for such vaccines because the drugs have limited effectiveness and unknown duration.

The New York Times

The conglomerate that begins the Bruce is separated from pre-Huronian schists by a profound erosional surface representing a time span of unknown duration.

Encyclopedia Britannica

"Without prejudging the outcome of mechanistic studies being written up for publication," he wrote, "it is entirely possible that granting your request could entail a delay of unknown duration with no public discussion or review of the strong new studies that are now available".

The Guardian - Lifestyle

Bafflingly assigned to a Saturday slot following three Wimbledon finals of unknown duration, with rain forecast several days ahead, the starry, costly and heavily promoted production of Henry IV Part 1 predictably had to be postponed during the tennis to 10pm, so that it ended at midnight ("no notice, rubbish scheduling", tweeted Polly Toynbee).

The Guardian

Human-verified similar examples from authoritative sources

Similar Expressions

6 human-written examples

Despite some datation uncertainties and the unknown durations of Lower Jurassic cycles, middle frequency sequences appear to be controlled by eustasy.

Journal of African Earth Sciences

We provide a positive answer by presenting a primal dual analysis to the online algorithm of Awerbuch et al. [3] for routing virtual circuits with unknown durations.

Theoretical Computer Science

Using the mentioned inclusion and exclusion criteria, 11 articles were excluded because of an unknown disease duration or disease durations longer than 10 years [ 9, 14, 16, 17, 34– 39, 44].

Clinical Rheumatology

In view of the unknown sampling duration time of DRFM-based jammer, we just select single time point ( {widehat{t}}_l^{min } ) in each segment [t l1, t l2] in Eq. (21).

EURASIP Journal on Advances in Signal Processing

Adherence and persistence were measured using claims data on a particular RA population of unknown disease duration, which may have accounted for the different result.

Arthritis Research and Therapy

Expert writing Tips

Best practice

When using "unknown duration", consider the context to ensure it clearly conveys the uncertainty about the time period. If precision is needed, explore methods to estimate or define a range for the duration.

Common error

While "unknown duration" is acceptable, avoid using it excessively in formal reports or academic writing. Instead, try to provide a reasonable estimate or range, even if approximate, to improve clarity and credibility. Phrases like "a period of several months" or "an indefinite period, potentially lasting years" can be more informative.

Linguistic Context

The phrase "unknown duration" functions primarily as an adjectival modifier describing a noun related to time or a process. It signifies that the length or extent of something is not known or specified, as Ludwig AI confirms.

Expression frequency: Very common

Frequent in

Science

37%

News & Media

33%

Encyclopedias

2%

Less common in

Formal & Business

0%

Social Media

0%

Reference

0%

Ludwig's WRAP-UP

The phrase "unknown duration" is a common and grammatically correct way to describe an unspecified length of time. As indicated by Ludwig, it's versatile and appears across a range of formal and informal contexts, with prominence in scientific and news-related content. When using this phrase, ensure it clearly conveys the uncertainty about the time period and consider whether a reasonable estimate could provide more clarity. For more formal communication, alternatives such as "unspecified duration" or "indefinite period" might be appropriate.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

unspecified duration

Emphasizes the lack of a defined duration.

uncertain duration

Highlights the doubt or uncertainty about the duration.

undetermined duration

Focuses on the fact that the duration has not yet been decided or established.

unknown length

Uses "length" instead of "duration", offering a more general term for time.

indefinite period

Replaces "duration" with "period", suggesting a broader, less precise timeframe.

unspecified time frame

Substitutes "duration" with "time frame", emphasizing the temporal aspect.

unfixed timeframe

Indicates that the end time is neither fixed nor certain.

unestablished timeframe

Highlights a lack of an initial determination of the end time.

unpredictable duration

Focuses on the impossibility to foresee the duration.

unforeseeable timeframe

Highlights the impossibility to foresee the timeframe.

FAQs

How can I use "unknown duration" in a sentence?

You can use "unknown duration" to describe events or situations where the length of time is uncertain. For instance, "The project is on hold for an "unknown duration" due to unforeseen circumstances."

What are some alternatives to "unknown duration"?

Alternatives include "unspecified duration", "uncertain duration", or "indefinite period" depending on the specific context.

Is it better to estimate the time instead of saying "unknown duration"?

In formal contexts, providing an estimate, even if approximate, is often preferable to stating "unknown duration". For example, instead of saying "the delay is of "unknown duration"", you could say "the delay is expected to last several weeks".

What's the difference between "uncertain duration" and "unknown duration"?

While similar, "uncertain duration" implies a lack of sureness or predictability, while "unknown duration" simply indicates that the duration is not currently known. They are often interchangeable, but "uncertain" adds a layer of doubt.