According to the Ramayana, Rama did rule for a total of 11,000 years. Whether he actually ruled or not is subject to whether you believe the account given in the Valimiki Ramayana or not. Krishna, on the other hand, did not continue for that long after the MB war. This we can ascertain by a little mathematical calculation. Parikshit was still in Uttara's womb when the war was over. Thereafter, he was crowned king when he was hardly 13 years old. And Krishna has already concluded his Avataric role before that. So we can guess after the MB war, Krishna and the Pandavas continued to live for only about 14 years max.