(2 rounds…10 minutes…600 seconds…that is when this fight will end.) The UFC’s first ever 5 round non-title affair started off on a rather eerie note last night, as Chris Leben crept toward the octagon accompanied by the song that did for Donnie Darko what Lux Aeterna did for Requiem for a Dream. And perhaps the haunting ballad was a sign of things to come, as it took just 2 rounds for Mark Munoz to make Leben hide his head and drown his sorrow like there was no tomorrow, no tomorrow.…