I spend about 4-6 hours of my day at work with my ETY's in.. a lot of the time with nothing playing. I am a big fan of isolation, and I know that IEMs are not for everyone, but they do the trick.
(in they go -> goodbye cruel world)
Mr. Potato Head: "Hey, Hamm. Look, I'm Picasso! " Hamm: "I don't get it. " Mr. Potato Head: "You uncultured swine! What're you lookin' at, ya hockey puck?"