On this computer it's 122 seconds, but on one of my old work computer, where I basically did nothing but play Minesweeper all day (Literally), I got into the 80's. Can't remmeber the exact time, but it was pretty impressive.

Oh, and 30 seconds is impossible. I think the world record (Yes, world record) is around 51 seconds. Definitely didn't do 30's. No doubt in my mind.