modessitt does it in about 15-20 minutes, but I bet he pulls all the caps and puts all the new ones in.
I usually say it takes about 1 minute per cap, but I can do faster. I've done a complete G07 rebuild - caps, curl mod, HOT, VR, fuse, width coil, and flyback - in 28 minutes.
Having the experience of a lot of monitor rebuilds, I bet I do them a lot different than people who do one a year. I don't buy cap kits, as I keep a lot of different value caps in bulk. I keep lists of many different kits, so I just go pull all the caps I need, then I arrange them on the bench in order of lowest to highest (by microfarad). Then - instead of pulling a capacitor, checking the location, comparing to the sheet, finding the cap, inserting it, soldering, clipping, marking off the sheet, etc - I just pull the cap, check it's value, grab the replacement, and put it in. I don't go down the list one at a time, trying to find the location for that cap. I just look at the chassis for a cap, then pull and replace it. I start in one corner and go around the board until I'm done. The only time I look at the list is if I pull something that doesn't seem to match what I'd expect (like the other day when I found a 10uf 450v cap in a spot that normally has a 47uf 200v cap). Goes pretty quick. I did a K7400 (about 40 caps) in under 30 mins yesterday. If you are doing a chassis with a large number of caps and are wondering if you got them all, just mark the top of all of them with a sharpie before you start.
I am sure Mod has done enough that he knows where each cap location is by memory.
Well, the experience does help when unsoldering caps from the bottom, as you tend to recognize the spots on those damn WG chassis that aren't screened on the bottom...