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The phrase "unprecedented length" is correct and usable in written English.
You can use this phrase to describe something that is longer than anything that has been seen or done before. For example, "The meeting went on for an unprecedented length of time."
Exact(17)
But space flights of unprecedented length are being planned.
Excavators with hydraulic arms of unprecedented length and power are one alternative.
Queues of unprecedented length had snaked towards the Albert Hall since lunchtime for the late-night concert.
Ever alert to the shock of the new, in 1910 the Observer reported that rehearsals for Richard Strauss's Elektra at Covent Garden were of "unprecedented length and severity".
Because Kovalchuk's contract was spread over 17 years -- an unprecedented length -- the salary cap figure for the Devils would have been $6 million a year.
Although these were the first photographs he had made in colour, the editors at Life gave the project a 24-page spread, an unprecedented length for a colour photo-essay.
Similar(42)
China, however, has taken this to unprecedented lengths.
At the same time, life expectancy has been extended to unprecedented lengths: A man reaching age 65 today can expect to live, on average, until age 83.
Now we might be approaching another age of great technological upheaval, as stem cells and gene therapy offer the potential to extend lives to unprecedented lengths.
Some boycotted his swearing-in ceremony in the capital, Abuja.But Mr Yar'Adua went to unprecedented lengths to prove his own integrity.
The European Central Bank has been going to unprecedented lengths to stimulate the economy (including trying out negative interest rates, and, through quantitative easing, minting a fresh sixty billion euros per month), but encouraging entrepreneurship in some manner might also be effective.
Related(20)
unexpected length
unique length
previous length
unreported length
exceptional length
monstrous length
outrageous length
tremendous length
enormous length
unknown length
extraordinary length
unmatched length
incredible length
rare length
unusual length
unprecedented streak
unprecedented severity
unprecedented challenge
unprecedented number
unprecedented fun
Write better and faster with AI suggestions while staying true to your unique style.
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