The phrase "acknowledged for some time" is correct and usable in written English.
It can be used when referring to something that has been recognized or accepted over a period of time.
Example: "The contributions of the research team have been acknowledged for some time in the scientific community."
Alternatives: "recognized for a while" or "accepted for a period of time."
Ross McEwan, the chief executive of RBS, said: "We have acknowledged for some time that mistakes were made.
The latest honour only makes official something that has been widely acknowledged for some time, that Morgan is Scotland's foremost living writer.
It has been acknowledged for some time that young children have innumerable contacts with women, but hardly any with men in the important early development years.
But county officials have acknowledged for some time that some unpopular steps will have to be taken to fix the county's finances.
It has been acknowledged for some time that poverty can be a trigger for poor mental health, but a new study published today by the World Health Organisation (WHO) argues that it is inequality that has the most profound and far-reaching consequences for individuals and wider society.
If a data packet has not been acknowledged for some time, it is considered lost and is retransmitted by the sender.
All the patients at the participating CMHCs are acknowledged for their time and patience in participating in the study.
All the therapists in the intervention group are acknowledged for their time, patience and effort in learning and using Integrated Treatment on their patients.
Government officials recently acknowledged for the first time that some detained protesters were tortured.
European finance ministers broke a taboo this week and acknowledged for the first time that some form of restructuring might be required to ease Greece's debt burden, which at 150 percent of annual output is among the highest in the world.
No, it wasn't: the first page of the FCC report says that: "On October 22 2010, Google acknowledged for the first time that 'in some instances entire emails and URLs were captured, as well as passwords'".
