The phrase "an indeterminate amount of" is correct and usable in written English.
It can be used when referring to a quantity that is not fixed or known.
Example: "The project requires an indeterminate amount of resources, making it difficult to budget effectively."
Alternatives: "an unspecified quantity of" or "a variable amount of".
There he stays for an indeterminate amount of time.
And for high achievers, the destabilizing effects of being forced out for an indeterminate amount of time cannot be underestimated.
The document remained at his home in Vienna, Va., for an indeterminate amount of time, the inspector general said.
The maximum punishment for such offences is an indeterminate amount of time in a solitary confinement cell.
Mr. Luccketti insists on the caveat that only a small number — fewer than a dozen — were present for an indeterminate amount of time.
Wolverine and his brother are recruited to join a special forces unit, which they remain in for an indeterminate amount of time.
Justice Benjamin Cardozo, in Ultramares Corp. v. Touche, 174 N.E. 441 (N.Y. 1931), expressed the danger of expanding the concept of duty in tort to include economic interests and consequent exposure of defendants "to a liability in an indeterminate amount for an indeterminate time to an indeterminate class.
We would need to continuously run the ADC, which takes a non-negligible and indeterminate amount of time to complete a conversion, and switch it among three channels.
An indeterminate amount ends up in various people's pockets.
But, according to the New Times Broward-Palm Beach, Hironimus received an ultimatum from Judge Jeffrey Gillen: Sign a form consenting to the procedure, or be stuck in jail for some indeterminate amount of time.
Dr. Crew is not tapping a long-term source; he is being offered a windfall of indeterminate amount and duration and being asked to improve students' test scores.
