The phrase "For all time" is correct and usable in written English.
It can be used to express a sense of permanence or eternity regarding a situation or condition.
Example: "This love will remain in my heart for all time."
Alternatives: "Forever" or "For eternity."
Exact(58)
'For all time.
For all time periods studied, water absorption increased as DDGS level increased.
"Is it just gone for all time?
It'll corrupt you for all time.
"That has been true for all time.
They are types fixed for all time.
It is for all time".
They're seen as there for all time.
It is a fable for all time.
Similar(2)
Statistics below are for all-time leaders.
Halls of Fame are for all-time greats.
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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