Reply To: Pre-GBS conditioning & GBS ambulatory status
In some cases of GBS, total paralysis can develop in a couple of days. More typically, maximum loss of strength is reached in about four weeks. It is always less than eight weeks, or is considered to be another related neuropathy.
There is variation in severity as well as timing. Not all GBS cases develop to total paralysis.
A good overview of GBS is available in Guillain-Barré Syndrome (from diagnosis to recovery), by Parry and Steinberg.