k i was rank 17800 i played osu for about 20 minutes or so and then i played a map where in which i had scored rank #722 on it several days ago. I ranked 150 higher on it so now im 550 or something overall on that map. my rank updated immediately afterwards from 17800 to 18000 soo....
http://puu.sh/4NevD.jpg
http://puu.sh/4NevD.jpg