Gyrs, you can look ingame how often you have finished Infected. Press J, choose Captain's Log(?), choose "Infected", write down your number.
Unity_Starbase, I find it hard to add your 25 days to the list of best times. My "best time" for KA according to my log is more than a day, but that is not quite correct, since it is not my actual playing time.
I agree that 45 mins is not out of the question. I went with one group where everyone on the team knew exactly what to do--we even did it even without ventrilo or skype. Our Ogden was also killed w/o 2nd spawning (not sure how we did it). I think our time was about 1 hour, but I'm sure more proficient groups can blaze through faster than us.