For figure drawing, it doesn't hurt to be a ways away. Being too close can create forshortening problems.
But for a portrait, I cannot see how you could benefit by being any farther away than ten feet at the most. Any farther than that and you are in for frustration. Why ask for trouble?
Consistency is really the key, I think, to developing a consistent drawing technique, whatever it may be. If you always have to change your drawing environment, it will be harder to be consistent in your drawing or painting.
I am never farther than 5' from my models, unless I am in a courtroom situation. But that is wretched drawing! Wretched!
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