I've played Osu obsessively for quite a while, but lost interest after becoming a good player. I think for the first 6 months I played it around 10-14 hours per day (was unemployed at that time), which was enough to get me into the top 1000. After that it turned into some kind of on/off game for me, since I didn't see much room for improvements. I was able to play pretty much every song and just grinding hidden double time to get a little higher in the rankings wasn't really worth the time, so I quit and started playing Stepmania. Nowadays I sometimes have months where I play around 2000-3000 songs in Osu, and then stop playing again for 3-4 months. I'd like to play more, since I've loved the game so much some years ago, but it's hard to force yourself to keep on going, since it's just super boring to play the game when there are no songs that you can't beat - having a song I couldn't beat was always the best motivation.