yeah, it doesn't take that long to get really good though. I went from someone who couldn't beat beginner to consistantly beating expert, cause I had a job as a telemarketer, and I'd just sit on the phone (headset) and play minesweeper for 8 hours straight. It was the only thing to do, all of my co-workers got into it too.
Then we got sick of it, and moved to crossword puzzles.