Used and loved by millions
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
During three days
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "During three days" is not correct in standard written English.
It is typically used to indicate a duration of time, but the correct form would be "For three days." Example: "We will be traveling for three days to explore the beautiful countryside."
⚠ May contain grammatical issues
News & Media
Science
Travel
Alternative expressions(3)
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
60 human-written examples
During three days of conversation I had with del Castillo, she was always wearing casual but elegant clothes.
News & Media
During three days on the witness stand, she cried while describing a painful sexual assault that left her frozen and unable to fight back or try to flee.
News & Media
During three days in November 1776, this petition sat in Scott's Tavern, on Wall Street, to be signed by anyone who wished.
News & Media
During three days of campaigning in South Carolina last week, where the crowds were smaller than in Iowa, there were no similar episodes.
News & Media
During three days of hearings in May, evidence was presented that the crew on the Colgan Air flight was poorly prepared.
News & Media
During three days in neurological examination have occurred fully left side ophtalmoplegia with diplopia, left side ptosis and hypestesis in V1 area.
During three days in March, 26 states, individuals and the National Federation of Individual Businesses, among others, challenged the law's constitutionality.
News & Media
During three days of negotiations in Geneva, Iran was offered limited respite from international economic sanctions in exchange for stopping the expansion of its nuclear activity.
News & Media
The bottom line During three days and four nights in Rio de Janeiro I spent about $79 a day on hotel, food, activities and local transportation.
News & Media
The bottom line: Beer Can House to fine arts I spent $137 a day during three days and nights in Houston on food, hotel and activities.
News & Media
We recorded during three days for more than 12 hours a day.
News & Media
Expert writing Tips
Best practice
When indicating a duration, use "for three days" instead of "during three days" for grammatical correctness. For example, "The conference lasted for three days" is preferred.
Common error
Avoid using "during" to express a duration. "During" specifies when something happened, not how long it lasted. Use "for" to indicate the length of time. For example, don't say "During three days, the city was under lockdown." Instead, say "For three days, the city was under lockdown."
Source & Trust
84%
Authority and reliability
3.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "During three days" functions as an adverbial phrase, aiming to specify a timeframe. However, as Ludwig AI points out, it's not grammatically correct. It attempts to modify a verb by indicating the period over which an action occurs, but it misuses the preposition.
Frequent in
News & Media
70%
Science
20%
Travel
10%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, while the phrase "During three days" is commonly found across various sources, including news, science, and travel, it's grammatically incorrect. Ludwig AI highlights that the correct way to express a duration is to use "for three days". Although the intention is generally understood, using the correct phrasing improves clarity and credibility, especially in formal or professional contexts. Remember to use "during" to specify when something happens, and "for" to indicate duration. Despite its frequent occurrence, aim for grammatical precision by opting for alternatives like "for three days", "over three days", or "throughout three days".
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
For three days
Uses the correct preposition to indicate a duration of time.
Over three days
Indicates a period spanning three days.
In the span of three days
Emphasizes the duration within which something occurs.
Throughout three days
Highlights the continuous nature of an event over the three-day period.
A three-day period
Refers to a specific period lasting three days.
During the three-day period
Specifies the time frame in which something happens.
Lasting three days
Describes something that continues for three days.
Across three days
Similar to "over three days", suggesting a spread across the time.
Throughout the course of three days
Emphasizes the progression of events over the duration.
A period of three days
A more formal way to refer to a three-day duration.
FAQs
What is the correct way to say "During three days"?
The grammatically correct way to express a duration of three days is to say "for three days".
When should I use "during" versus "for"?
"During" is used to specify when something happens within a period, while "for" indicates the length of time something lasts. For example, "I slept during the movie" vs. "I slept "for three hours"".
Are there alternatives to "During three days"?
Yes, you can use phrases like "over three days", "in the span of three days", or "throughout three days", although "for three days" is generally the most straightforward and grammatically correct.
Is "During three days" grammatically correct?
No, "During three days" is not considered grammatically correct in standard English. The correct preposition to use when indicating a duration is "for", so the correct phrase is "for three days".
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
3.8/5
Expert rating
Real-world application tested