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The phrase "an additional four years" is correct and usable in written English.
You can use it when referring to an extension of time or duration, typically in contexts such as contracts, education, or project timelines.
Example: "The project deadline has been pushed back by an additional four years due to unforeseen circumstances."
Alternatives: "four more years" or "an extra four years."
Exact(30)
It also agreed to restrict some of its rights an additional four years.
If it had missed this rendezvous, the journey would have taken an additional four years.
The same man later served an additional four years on a larceny conviction.
Billings under a one-year contract were estimated at $5 million; the contract is eligible for an additional four years.
And so, Mayor Michael R. Bloomberg's current flirtation with expanding term limits to allow an additional four years is causing no shortage of consternation for Mr. Jones.
In June, Arena led the United States to the quarterfinals of the World Cup, its best performance since 1930, and the federation wants him to stay on for an additional four years.
Similar(30)
An average of an additional two years further reduces the supply shortfall to 2.4% in 2021.
If breached he could face an additional five years imprisonment.
Which could be as long as an additional nine million years.
He was sentenced to prison for an additional five years.
The three-year deals in question can be renewed for an additional three years.
More suggestions(2)
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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