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Discover LudwigThe phrase "opened at" is correct and usable in written English.
It is typically used to indicate the time or location where something was initiated or made accessible.
Example: "The exhibition opened at 10 AM on Saturday."
Alternatives: "launched at" or "commenced at".
Exact(59)
Polls opened at 8am.
That Next store opened at 5am.
THE HEAVENS have opened at last.
Plotwise, Downton opened at a snoozy level.
The picture opened at forty million.
The store finally opened at 10.
The diner opened at 11 30.
I opened at random.
It opened at noon.
The zoo opened at ten.
The bidding opened at £10.
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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