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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
when they have time
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "when they have time" is correct and usable in written English.
It can be used to refer to a situation where someone is free or available to do something at their convenience. Example: "I will ask them to review the document when they have time."
✓ Grammatically correct
News & Media
Science
Formal & Business
Alternative expressions(13)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
35 human-written examples
Only dermatologists and podiatrists still have a few -- when they have time to use them.
News & Media
"And when they have time, they're generally found on the golf course as opposed to coming to a golf museum".
News & Media
But three years is a long time, and when they have time to strategize how to get there, it's safer".
News & Media
When they have time to get away, they hop on Sergeant Wheeler's boat and head for Montauk or Cape Cod.
News & Media
That's why most footballers are at their most vulnerable when they have time to think in front of goal.
News & Media
He said: "We have said repeatedly the next phase would be one of terrorising people and when they have time they will begin destroying temples.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
24 human-written examples
On the rare occasion when they had time to peer downfield, they found receivers blanketed.
News & Media
Of course, the Europeans are objecting strongly to that idea at the moment, but it may look better when they've time to consider the alternative.
News & Media
Mr. Maeda and Mr. Ariga, who both became schoolteachers in Ishikawa after the war, said their silence continued until after retirement two decades ago, when they had time to ponder their wartime experiences.
News & Media
This allowed subjects to do the test effortlessly when they had time for it.
When they had time, they would build a sod house.
Wiki
Expert writing Tips
Best practice
Use "when they have time" to indicate that an action will occur based on someone's availability, ensuring clarity and consideration for their schedule.
Common error
Avoid relying solely on "when they have time" in every instance. Vary your language by using alternatives like "when they are available" or "at their convenience" to add nuance and avoid repetition.
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "when they have time" functions as an adverbial clause of time, modifying the main clause by specifying when an action or event takes place. Ludwig examples illustrate its usage in various sentence structures to indicate conditional timing.
Frequent in
News & Media
63%
Science
25%
Wiki
9%
Less common in
Formal & Business
3%
Reference
0%
Encyclopedias
0%
Ludwig's WRAP-UP
The phrase "when they have time" is a common and grammatically correct way to express that an action will occur based on someone's availability. According to Ludwig, its most frequent use is in news and media contexts. While versatile, it's important to use alternatives like "when they are available" or "at their convenience" to avoid overuse. Consider the level of formality required and the certainty you wish to convey. Be mindful that, although grammatically valid, rewording may enhance clarity and maintain engagement, so it is important to ensure you are not overusing the phrase.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
when they are available
Replaces "have time" with a direct synonym for availability, maintaining a similar level of formality.
when they get a chance
Focuses on the opportunity arising, rather than explicitly stating time availability.
when their schedule allows
Emphasizes a structured schedule as the determining factor for availability.
at their convenience
Shifts the emphasis to the subject's preference for when the action occurs.
when they find an opportunity
Highlights the active seeking or discovery of a suitable moment.
as soon as they are able
Implies a sense of urgency and immediacy once availability is established.
in their own time
Suggests a relaxed, unhurried approach to completing the action.
if and when they are free
Adds a conditional aspect, emphasizing uncertainty about future availability.
when they can spare some time
Indicates that the time allocated might be limited or taken from other activities.
when time permits
Expresses the dependence on external circumstances allowing for the action.
FAQs
What's a more formal way to say "when they have time"?
For a more formal tone, you could use phrases like "at their convenience" or "when their schedule permits". These options offer a similar meaning but are better suited for professional or academic contexts.
How can I use "when they have time" in a sentence?
You can use "when they have time" to express that an action will be performed when someone is available. For example, "I'll ask them to review the report "when they have time"".
Is it correct to say "when they will have time"?
While grammatically correct, "when they will have time" can sound slightly awkward. "When they have time" is generally preferred and more concise. If you need to emphasize the future, consider "when they are expected to have time" or "when they anticipate having time".
What's the difference between "when they have time" and "if they have time"?
"When they have time" implies a higher likelihood of the action occurring, dependent on their schedule. "If they have time" introduces more uncertainty, suggesting the action may not happen at all. Consider the context and the level of certainty you want to convey.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
4.5/5
Expert rating
Real-world application tested