certain number of hours

USAGE SUMMARY

The phrase "certain number of hours" is correct and usable in written English.
You can use it when referring to a specific amount of time that is not precisely known. For example, "I must complete the project in a certain number of hours."

✓ Grammatically correct

News & Media

Science

Academia

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

That could be limited to a certain number of hours a week.

The Guardian

They may also seek regular assistance for a certain number of hours a month.

The New York Times

A calendar is finite; there are only a certain number of hours in a day.

Harvard Business Review

You will be required to log a certain number of hours per week.

University of California, Berkeley

You have a certain number of hours during the day, and you decide who does what when".

The New York Times - Magazine

"If they have a job, they work a certain number of hours as well as they can".

The New York Times

You have to take these (AIDS) drugs a certain number of hours each day, or they don't work.

The New York Times

It replaces a system that if you worked beyond a certain number of hours you fell off a cliff edge.

The Guardian

Periodically, after a certain number of hours of flight time, an air craft has to be grounded for maintenance check.

The New York Times

After a certain number of hours of running, no two mechanical components are completely the same due to normal wear or foreign object damage.

Advances in Engineering Software

Part-time workers, now an increasing portion of the work force, should also be able to qualify if they work a certain number of hours.

The New York Times

Expert writing Tips

Best practice

Use "certain number of hours" when you want to indicate a specific quantity of time without being precise, often because the exact amount is unknown or variable.

Common error

Avoid using "certain number of hours" when a more precise time frame is available or necessary for clarity. Being too vague can diminish the credibility or impact of your statement.

Linguistic Context

The phrase "certain number of hours" functions as a determiner phrase quantifying time. As confirmed by Ludwig, it's used to express a quantity of time without specifying the exact amount. It typically modifies a noun or noun phrase related to an activity or requirement.

Expression frequency: Very common

Frequent in

News & Media

55%

Science

25%

Academia

10%

Less common in

Formal & Business

5%

Wiki

5%

Reference

0%

Ludwig's WRAP-UP

In summary, "certain number of hours" is a grammatically correct and commonly used phrase for indicating an unspecified duration. As Ludwig AI confirms, it serves to quantify time without specifying an exact amount, offering flexibility or acknowledging uncertainty. While versatile, be mindful of overusing vagueness in situations that require precision. Alternatives such as "specific duration of time" or "a set number of hours" can provide nuanced expressions of the same concept. Across various authoritative sources, from news outlets like The New York Times to scientific journals, its frequent appearance underscores its relevance in different contexts. Remember to tailor your choice to suit the specific nuance you wish to convey.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

a set number of hours

Focuses on the predetermined or arranged quality of the hours.

specific duration of time

Emphasizes the duration aspect rather than the numerical quantity.

a given number of hours

Similar to "set number", suggesting that the quantity of hours is already known or established.

defined period of time

Highlights the defined or set nature of the time period.

particular amount of time

Replaces "number" with "amount" and "certain" with "particular" to soften the vagueness.

fixed duration

Focuses on the immutability or pre-arranged nature of the duration.

predetermined time frame

Highlights that the time frame was set beforehand.

designated hours

Uses "designated" to mean the hours are specifically assigned.

allotted time

Implies that the time has been assigned or given for a specific purpose.

some hours

A simpler and less formal way to indicate a quantity of time.

FAQs

How can I use "certain number of hours" in a sentence?

You can use "certain number of hours" to refer to an unspecified amount of time. For example, "Employees are required to complete a "certain number of hours" of training each year".

What are some alternatives to "certain number of hours"?

Alternatives include "specific duration of time", "defined period of time", or "particular amount of time", depending on the context.

Is it appropriate to use "certain number of hours" in formal writing?

Yes, "certain number of hours" is acceptable in formal writing when the exact duration is unknown or unimportant. However, strive for more precision if possible.

How does "certain number of hours" differ from "specific number of hours"?

"Certain number of hours" implies an unspecified quantity, whereas "specific number of hours" suggests a precise or known amount, even if it's not explicitly stated.