The difference between "fully recovered" and "rebuilding technique" is basically the same as "beginner with no problems" to "virtuoso". I have eliminated focal dystonia, but now need to build speed and control. This is a laborious process, because not paying full attention will re-aggravate the dystonic spasms. As far as how long it takes, I figured, perhaps incorrectly, that, since it took some 40 years to develop FD, it might take more than a few months to fix it. I also never had the luxury of not playing for a living, so my recovery was definitely made longer by performing all the time. As far as Jerald's method is concerned, I have been working with him for over 3 years, and I do very little playing during lessons, since, FD is a brain problem, not a physical one, and it seems necessary to really "map" the techniques onto the brain, which takes as much thinking and visualizing as it does practicing. I know this: when I do what he says, I improve. When I don't, I slip back.
Lester Devoe Flamenco Negra
Lester Devoe Flamenco Blanca
Aparicio Flamenco Blanca with RMC pickup
Bartolex 7-string with RMC pickup
Giannini 7-string with Shadow pickup
Sal Pace 7-string archtop