from WHICH symptome, would be correct to ask.from occasional twitches in the back and then paralysis in the hand - yep, maybe years can pass because most probably they are unrelated completely due to high occurence of twitches in the population and lack of anatomical relationship between twitching place and onset place.From the clinical weakness - days, weeks, not more. clinical exam and EMG are rather quick methods. People with paresis and strange pathological reflex combinations usually do not need too much time to be diagnosed.
