John, I know I've said this to you before, but "normal" is going to be different for you because of your disability. So your doctor or physical therapist would be the best person to ask about what sort of improvement is normal for you.
That being said, I advanced pretty quickly when I started out...going from inactive to active can drive your body to make great strides in a small amount of time. Future improvements will probably come more slowly, since your body will adapt and need to be continually challenged.
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