The Chamber has not rendered its decision yet.
In his request, an American member of the Prosecution Office, Don Webster, asked the deadline to be remitted from May 2 to June 2.
According to the Tribunal's initial timeline, Matthieu Ngirumpatse's defence was slated to wind up its proceedings in January. It is now scheduled to end on February 18.
The case of the other defendant in this joint trial, Edouard Karemera, has already been presented.
A court ruling issued on November 30, 2010, ordered each accused to file a final brief of less than 53,000 words while the Prosecution was given 73,000 words.
As of yet, no date has been set for the hearing of the closing arguments.
Ngirumpatse and Karemera are charged with genocide and crimes against humanity. They allegedly conspired with other top civil and military officials to perpetrate the 1994 genocide.
Their trial began in September 2005.
© Hirondelle News Agency