Applied 6/1, conditional approval on 6/23, and the first available appointment at LAX was 7/24. I've been checking pretty regularly for earlier appointments to open up, and I got one today. I checked before I left for work and they were into August, but when I checked after I got in they had one for this evening and I snagged it. Traffic was light so I arrived about 45 minutes early, had to wait about 10 minutes before they called me, and then was done in about 3 minutes. No questions, he just looked like he was flipping through the application, said it's all in order, took my picture and prints and read me the "this doesn't give you any special rights, just cuts in line" spiel. It took me longer to get coffee across from their office than to get through. Approval hasn't come through yet "takes up to about a week, and just depends on when your prints clear".
Well worth it to check back frequently for appointments to open up. If I lived closer to LAX or the Long Beach port I could have gotten a morning appointment earlier - they seem to open up more.