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The phrase "spanning several tens" is correct and usable in written English.
It can be used to describe a range or extent that covers multiple tens, often in contexts like measurements, time, or quantities. Example: "The project will take place over a period spanning several tens of weeks, ensuring thorough development and testing."
Exact(1)
However, direct-use pipelines spanning several tens of kilometres have been installed with a temperature loss of less than 2 5 °C (3.6 9 °F), depending on the flow rate.
Similar(58)
It is also a sequence of moods, with impassioned voices calling out from the 80 scrolls and inscribed fans spanning several centuries, including the 21st, that line the galleries.
Data to help predict the likelihood of future offending is drawn from studies spanning several decades.
The town's Old Cemetery is a great, sprawling place, spanning several acres.
In general preparations for surgery of this sort include EEG and video records spanning several weeks.
That career neatly overlapped with Stalin's rule, spanning several waves of mass arrests.
The generalized minimum spanning tree problem consists of designing a minimum cost tree spanning several clusters.
Deft writing, spanning several languages, check.
Both also have ten major primary works spanning several decades.
That suspension was enforced after legal challenges spanning several seasons.
Search teams scoured an area spanning several miles, but there was no sign of Kyron.
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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