By Peter Griffiths

LONDON (Reuters) - A British computer hacker accused by the United States of breaking into top secret military and space agency networks will learn the result of his six-year fight against extradition within three months, a court heard on Tuesday.

Gary McKinnon faces up to 60 years in jail if convicted in American courts for what one U.S. prosecutor has described as the "biggest military computer hack of all time".

U.S. officials say he knocked out hundreds of military computers in the months after the September 11, 2001 attacks, undermining security and causing damage worth nearly $1 million.

McKinnon, 46, admits hacking into Pentagon and NASA computers from his bedroom in London, but says he was only looking for evidence of aliens and UFOs.

He suffers from Asperger's syndrome, a form of autism, and his lawyers say he is too ill to be sent for trial in the United States.

British Home Secretary (interior minister) Theresa May will announce her decision on whether McKinnon should be sent to the United States for trial by mid-October, a lawyer representing the British government told the High Court in London.

May has been studying medical reports before making up her mind and has been busy supervising the security for the Olympic Games, which open in London on Friday. Her spokesman had no immediate comment on the case.

McKinnon's mother Janis Sharp said the further delay was unacceptable. Continued...