It depends on the song. If i like the song then i dont mind repeating it over and over and over and over. But if its some crap that I hate then i'll try max 5-6 times and drop it for the day. Nowdays I rarely grind a map but i used to do it when I were learning hpw to play the game. My historical tab reflects this pretty well cause most of the songs there are hards/easier insanes.