Hi Dhall,
This monster first was in my left forearm and hand due to surgery after a very bad truck accident. As it got worse my hand began to claw up to the point of my fingers pressing my wrist where you check the pulse. To relieve the pressure and make my hand look somewhat normal I surgically had my wrist fused and a 4" plate placed across from my forearm to my hand to hold it straight. I lost the control of my fingers.
Then the spread started. First to my left side from the shoulder to my foot. I thought this was due to the rod and plate in me.
Then my face became numb and drooped so a CT scan was taken and this is when the shrinking of my cerebellum was fist noticed.
My monster spread to my central nervous system at the brain stem area where the spine meets the brain.
Now CRPS has taken over my entire body through my nervous system running everywhere.
Between the lack of control of my motor skills, being forced to use a wheelchair and the constant nerve and bone pain it's now become a daily battle. Some days are okay and some are not.
Days like today when the triggers are hitting hard I wish I could take something to go totally physically "comfortably numb".
To answer your question, from the accident to full body CRPS took around three years.
Well that's my story anyway. Thanks for listening...

Mine first began to spread after I had a lumbar sympathetic block meant to help the RSD in my left ankle. The spread pain started at the injection site in my lower back, then crept up my spine, the to my neck, then shoulders, around to my torso, then down my arms, and eventually to my hands. later...it spread up my leg to my knee, and after a bump from a visiting nephew it spread to my left hip. just last year I had a baby via c section and I now have the RSD internally in my abdomen where they sliced through all the nerves.

Congradulations on the baby, more power to you for not letting CRPS stop your life!
How long did all this take?

The spread throughout my body all happened within a couple months of the block I had...the spread to my abdomen after the c section was immediately after the c section...though it was hard to tell at first if what I was feeling was "normal" or the RSD...but 8 weeks after I had the baby the doctor said the pain should've completely subsided and it was still just as bad.