The Akasha brothers facing drug-trafficking charges in the US will be sentenced on March 15 and not February 1 as earlier scheduled, according to the federal judge presiding over the case.
The postponement means Baktash and Ibrahim Akasha will have been held in New York detention centres for more than two years when they finally learn their fate.
As part of a deal made in October with US prosecutors, each is facing a prison term that could range from 10 years to life.
The brothers agreed then to plead guilty to seven criminal charges, including bribing unnamed Kenyan officials.
The terms of the agreement also indicate that the Akashas may each be fined up to $10 million (Ksh1 billion) and be required to forfeit all the money obtained through their confessed drug dealings.
Judge Victor Marrero acceded last week to a request by defence attorneys for postponement of sentencing on the grounds that they needed more time to develop information to be presented as potentially mitigating factors.