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
in multiple days
Grammar usage guide and real-world examplesUSAGE SUMMARY
"in multiple days" is correct and usable in written English.
You can use it when you need to indicate that something is going to take more than one day to complete. For example, "I plan to finish this project in multiple days."
✓ Grammatically correct
Science
News & Media
Wiki
Alternative expressions(20)
over several days
spanning a few days
across a number of days
lasting several days
for a period of days
during numerous days
on several occasions
on previous days
in various days
on rainy days
on warm days
a day together
one day apart
a week apart
two gifts in a row
two questions in a row
two Tests in a row
a day apart
on windy days
in separate stages
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
5 human-written examples
In particular, for a dataset that contains posts in multiple days, the system will slice the dataset into multiple subsets such that each subset contains the posts of the same day.
In a case such as this, which is grounded in multiple days of conflicting testimony, which is challenging the constitutionality of state statutes, and which is implicating important policy questions, I would expect the court itself to write up a detailed decision with findings of fact and conclusions of law in support of the judgment.
News & Media
Appointments, tests and group meetings often occurred on different days resulting in multiple days off work.
Science
Interestingly, even patients with severe illness resulting in multiple days in bed did not tend to utilize clinics or hospitals.
Science
The high dispersion and late peak of the epidemic curve may be a hint that infection could have taken place in multiple days.
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
And it's the ones principally that are in for surgical procedures, or maybe they have a regimen with radiation that are in for multiple days.
Academia
Stocking up is an issue that occurs in horses that are held in stalls for multiple days after periods of activity.
Wiki
"In 1999, when there were multiple days in the 90's during July, water use skyrocketed.
News & Media
There are many reasons for this but frustrated female coaches speak about the institutional obstructions from costs, the structure of courses (many are conducted in blocks of multiple days), and a lack of opportunities to gain experience to progress to the next level.
News & Media
But usually, this time can be measured in hours, not multiple days.
News & Media
Animal surgeries were done in parallel over multiple days.
Science
Expert writing Tips
Best practice
When planning a project, use "in multiple days" to communicate that the work will be completed over more than one day. For example, "The data collection will be performed "in multiple days" to ensure accuracy."
Common error
Avoid using "in multiple days" when referring to a single day with multiple events; instead, clarify whether events occur on different days or are spread over a period, i.e. "The event occurred on several different days" versus "The event occurred on one day with multiple activities".
Source & Trust
80%
Authority and reliability
4.2/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "in multiple days" functions as an adverbial phrase, specifying the timeframe or duration of an event or activity. Ludwig's examples show that it's used to indicate that something extends beyond a single day.
Frequent in
Science
50%
News & Media
40%
Wiki
10%
Less common in
Formal & Business
0%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
The phrase "in multiple days" is a grammatically sound way to express that something takes place over several days. Ludwig AI indicates that it is correct and usable in written English. While not the most frequent expression, as Ludwig's analysis points out, it appears across various domains, especially in science and news. When using this phrase, make sure that the intent is to express a duration longer than a single day and not a single day with multiple occurrences. For more variety, consider using alternatives such as "over several days" or "spanning a few days".
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
over several days
Replaces "multiple" with "several", indicating more than two days.
spanning a few days
Emphasizes the duration covering a few days.
across a number of days
Uses "a number of" instead of "multiple", suggesting an unspecified quantity of days.
lasting several days
Highlights the duration of an event or activity over a period of days.
for a period of days
More formal, emphasizing a specific length of time.
during numerous days
Substitutes "multiple" with "numerous", implying many days.
on several occasions
Shifts the focus to the frequency of events over a few days.
throughout a few days
Highlights that something happens consistently during several days.
in the course of a few days
Highlights that something happens during a set time period.
over a series of days
Emphasizes that the timeframe is consecutive, but still more than one day.
FAQs
How can I use "in multiple days" in a sentence?
You can use "in multiple days" to indicate that an activity or event will take place over more than one day. For example, "The conference will be held "in multiple days", allowing for more in-depth discussions."
What's the difference between "in multiple days" and "over several days"?
Both "in multiple days" and "over several days" are similar, but "in multiple days" is more general, while "over several days" suggests a slightly longer or more continuous period.
Is it correct to say "in multiple day" instead of "in multiple days"?
No, "in multiple day" is grammatically incorrect. The correct phrase is "in multiple days", as it refers to more than one day.
What are some alternatives to using the phrase "in multiple days"?
Alternatives include "over several days", "spanning a few days", or "across a number of days", depending on the context.
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
80%
Authority and reliability
4.2/5
Expert rating
Real-world application tested