Not much these days although I used to a lot. I believe over practicing can be a bad thing (on your own at least). All my practicing these days comes from playing live, doing recordings or just jamming with other people. That's the best way to progress. I also believe it's just as important to bring other non musical influences of your life into your music and playing. That's where the feel comes from and what makes it individual and interesting. Anyone can play fast or tight if they practice enough but not everyone can be creative, individual or moving. That said, I do admire some technically advanced players when it's tastful, but no more so than say Phil Rudd of AC/DC and his "bum-tits". I think of it the same way as a conversation....It's better to say nothing than to talk loads of shit!