Disability from Guillain-Barre syndrome depends on whether it's affecting primarily the nerve insulation (demyelinating) or the nerves themselves - much longer for the latter with the possibility of poor / incomplete recovery. Also depends on how extensive the damage was and how quickly this is diagnosed and treated. Condition can be life threatening.

Usually there will be some amount of neurologic deficits causing disability for a few months. Due to the great variation in severity however this disability may extend for many months to years - sometimes incomplete recovery.