One might wonder why someone would lie with times that high..
I think rolkien said the posted times were in the miliseconds. I have 2 theories:
1) Cosmic submitted times, accidently putting minutes in the miliseconds, and changed the times accordingly
2) Cosmic realized he looked like a complete dumbass, and that his scheme at being the second sadisticmystic with almost all records on the site was beyond reach. and Sadistic, they may have been up for 1 month because he posted times, but maybe they were in such a maligned category that they wouldn't be noticed. Or, maybe nobody was really looking extensively at his times, I know that sometimes I'll be looking at times, and I'll be like "Oh, 10 seconds for egg golemn, cool, I'll try and beat that, wonder how he did it."