Gus .... I can't comment on "book time" but you should be able to do it in a long afternoon. The trick is to remove the fuel tank to gain access. The other alternative is to drop the rear end and I find that the fuel tank is easer than driveshaft, springs and brake lines.
When installing the split boot, the split goes at 9:00. That is facing to the rear in the middle of the axle. I use weather strip rubber adhesive in the split and then the hog nose clamps. Be sure all oil is out of the split before gluing (use plenty of brake cleaner).
Jim Villers
190SL, 230SL 5-Speed, 190E 2.3-16 Kompressor, MGB 5-Speed