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Discover LudwigThe phrase "at zero hour" is correct and usable in written English.
It is typically used to refer to a specific time, often in a military or urgent context, indicating the moment something is set to begin or occur.
Example: "The operation was scheduled to commence at zero hour, and all teams were on high alert."
Alternatives: "at the appointed time" or "at the designated hour".
Exact(15)
Excerpt: We hit the beachhead at zero hour, just as the first light of dawn kissed the sky.
It says a war against the Shiites must start soon -- at "zero hour" -- before the Americans hand over sovereignty to the Iraqis.
"The move was so slow that my own Company ('B') only arrived in the front line at zero hour and had to jump out over the top immediately on arrival.
Group was CLP + administration of DF-MSC at zero hour and V. Group was CLP + administration of DF-MSC at fourth hour.
Additionally, damage that is invisible at zero hour, i.e. in parameter or product tests, needs to be detected by fast wafer level reliability (fWLR) monitoring on the fully produced wafer.
The width of the wound was calculated for each dose on the pictures, and percentage migration was expressed as follows: Percent relative wound width = Wound with of untreated or formulations Wound width at zero hour.
Similar(45)
A-B is the level of Income Support entitlement at zero hours of work.
The fix frequency was set at two hour intervals.
Cardiorespiratory parameters were systematically recorded at six hour intervals.
Alternatively, cells were counted manually at twelve hour intervals using a hemacytometer.
It ran at nine hours.
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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